diff --git a/Cargo.toml b/Cargo.toml
index a0a5a1f6..785d8115 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,3 +7,11 @@ members = [
   "ecdsa",
   "transcript"
 ]
+
+
+# remove once 
+# https://github.com/privacy-scaling-explorations/halo2/pull/162
+# is merged
+[patch."https://github.com/privacy-scaling-explorations/halo2.git"]
+halo2_proofs = { git = "https://github.com/scroll-tech/halo2.git", branch = "halo2-ecc-snark-verifier-0220" }
+
diff --git a/ecc/Cargo.toml b/ecc/Cargo.toml
index 5f221e20..7b1c9869 100644
--- a/ecc/Cargo.toml
+++ b/ecc/Cargo.toml
@@ -10,7 +10,6 @@ num-bigint = { version = "0.4", features = ["rand"] }
 num-integer = "0.1"
 num-traits = "0.2"
 rand = "0.8"
-group = "0.12"
 subtle = { version = "2.3", default-features = false }
 
 [dev-dependencies]
diff --git a/ecc/src/base_field_ecc.rs b/ecc/src/base_field_ecc.rs
index a79ac760..6d79898e 100644
--- a/ecc/src/base_field_ecc.rs
+++ b/ecc/src/base_field_ecc.rs
@@ -340,9 +340,6 @@ impl<C: CurveAffine, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
 
 #[cfg(test)]
 mod tests {
-    use std::marker::PhantomData;
-    use std::rc::Rc;
-
     use super::BaseFieldEccChip;
     use super::{AssignedPoint, EccConfig, Point};
     use crate::curves::bn256::G1Affine as Bn256;
@@ -351,10 +348,12 @@ mod tests {
     use crate::integer::rns::Rns;
     use crate::integer::NUMBER_OF_LOOKUP_LIMBS;
     use crate::maingate;
-    use group::{Curve as _, Group};
-    use halo2::arithmetic::{CurveAffine, FieldExt};
+    use halo2::arithmetic::CurveAffine;
     use halo2::circuit::{Layouter, SimpleFloorPlanner, Value};
     use halo2::plonk::{Circuit, ConstraintSystem, Error};
+    use integer::halo2::ff::{Field, FromUniformBytes, PrimeField};
+    use integer::halo2::group::Curve;
+    use integer::halo2::group::Group;
     use integer::maingate::RegionCtx;
     use maingate::mock_prover_verify;
     use maingate::{
@@ -363,6 +362,8 @@ mod tests {
     };
     use paste::paste;
     use rand_core::OsRng;
+    use std::marker::PhantomData;
+    use std::rc::Rc;
 
     const NUMBER_OF_LIMBS: usize = 4;
     const BIT_LEN_LIMB: usize = 68;
@@ -419,7 +420,10 @@ mod tests {
             }
         }
 
-        fn config_range<N: FieldExt>(&self, layouter: &mut impl Layouter<N>) -> Result<(), Error> {
+        fn config_range<N: PrimeField>(
+            &self,
+            layouter: &mut impl Layouter<N>,
+        ) -> Result<(), Error> {
             let range_chip = RangeChip::<N>::new(self.range_config.clone());
             range_chip.load_table(layouter)?;
 
@@ -505,7 +509,10 @@ mod tests {
 
     #[test]
     fn test_base_field_ecc_addition_circuit() {
-        fn run<C: CurveAffine>() {
+        fn run<C: CurveAffine>()
+        where
+            C::Scalar: FromUniformBytes<64>,
+        {
             let circuit = TestEccAddition::<C>::default();
             let instance = vec![vec![]];
             mock_prover_verify(&circuit, instance);
@@ -580,7 +587,10 @@ mod tests {
 
     #[test]
     fn test_base_field_ecc_public_input() {
-        fn run<C: CurveAffine>() {
+        fn run<C: CurveAffine>()
+        where
+            C::Scalar: FromUniformBytes<64>,
+        {
             let (rns, _) = setup::<C>(20);
             let rns = Rc::new(rns);
 
@@ -650,7 +660,6 @@ mod tests {
             layouter.assign_region(
                 || "region 0",
                 |region| {
-                    use group::ff::Field;
                     let offset = 0;
                     let ctx = &mut RegionCtx::new(region, offset);
 
@@ -677,7 +686,10 @@ mod tests {
 
     #[test]
     fn test_base_field_ecc_mul_circuit() {
-        fn run<C: CurveAffine>() {
+        fn run<C: CurveAffine>()
+        where
+            C::Scalar: FromUniformBytes<64>,
+        {
             for window_size in 1..5 {
                 let aux_generator = <C as CurveAffine>::CurveExt::random(OsRng).to_affine();
 
@@ -739,7 +751,6 @@ mod tests {
             layouter.assign_region(
                 || "region 0",
                 |region| {
-                    use group::ff::Field;
                     let offset = 0;
                     let ctx = &mut RegionCtx::new(region, offset);
 
diff --git a/ecc/src/base_field_ecc/mul.rs b/ecc/src/base_field_ecc/mul.rs
index 96aa89be..836196db 100644
--- a/ecc/src/base_field_ecc/mul.rs
+++ b/ecc/src/base_field_ecc/mul.rs
@@ -1,9 +1,9 @@
 use super::{AssignedPoint, BaseFieldEccChip};
 use crate::maingate::{AssignedCondition, AssignedValue, MainGateInstructions};
 use crate::{halo2, Selector, Table, Windowed};
-use group::ff::PrimeField;
 use halo2::arithmetic::CurveAffine;
 use halo2::plonk::Error;
+use integer::halo2::ff::{Field, PrimeField};
 use integer::maingate::RegionCtx;
 
 impl<C: CurveAffine, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
@@ -16,14 +16,13 @@ impl<C: CurveAffine, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
         bits: &mut Vec<AssignedCondition<C::Scalar>>,
         window_size: usize,
     ) -> Result<(), Error> {
-        use group::ff::Field;
         assert_eq!(bits.len(), C::Scalar::NUM_BITS as usize);
 
         // TODO: This is a tmp workaround. Instead of padding with zeros we can use a
         // shorter ending window.
         let padding_offset = (window_size - (bits.len() % window_size)) % window_size;
         let zeros: Vec<AssignedCondition<C::Scalar>> = (0..padding_offset)
-            .map(|_| self.main_gate().assign_constant(ctx, C::Scalar::zero()))
+            .map(|_| self.main_gate().assign_constant(ctx, C::Scalar::ZERO))
             .collect::<Result<_, Error>>()?;
         bits.extend(zeros);
         bits.reverse();
diff --git a/ecc/src/ecc.rs b/ecc/src/ecc.rs
index b7365a2e..a2c7959b 100644
--- a/ecc/src/ecc.rs
+++ b/ecc/src/ecc.rs
@@ -1,9 +1,9 @@
-use crate::halo2::arithmetic::{CurveAffine, FieldExt};
+use crate::halo2::arithmetic::{CurveAffine, PrimeField};
 use crate::integer::chip::IntegerConfig;
 use crate::integer::rns::{Integer, Rns};
 use crate::integer::AssignedInteger;
 use crate::maingate::{big_to_fe, Assigned, AssignedCondition, MainGateConfig, RangeConfig};
-use crate::FieldExt;
+use crate::PrimeField;
 use group::Curve;
 use num_bigint::BigUint as big_uint;
 use num_traits::One;
@@ -12,13 +12,13 @@ use std::rc::Rc;
 
 /// Represent a Point in affine coordinates
 #[derive(Clone, Debug)]
-pub struct Point<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+pub struct Point<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
 {
     x: Integer<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>,
     y: Integer<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>,
 }
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     Point<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     /// Returns `Point` form a point in a EC with W as its base field
@@ -58,8 +58,8 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
 #[derive(Clone)]
 /// point that is assumed to be on curve and not infinity
 pub struct AssignedPoint<
-    W: FieldExt,
-    N: FieldExt,
+    W: PrimeField,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 > {
@@ -67,7 +67,7 @@ pub struct AssignedPoint<
     pub(crate) y: AssignedInteger<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>,
 }
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize> fmt::Debug
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize> fmt::Debug
     for AssignedPoint<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
@@ -79,7 +79,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
     }
 }
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     AssignedPoint<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     /// Returns a new `AssignedPoint` given its coordinates as `AssignedInteger`
@@ -166,9 +166,9 @@ pub(crate) fn make_mul_aux<C: CurveAffine>(
 /// Allows to select values of precomputed table in efficient multiplication
 /// algorithm
 #[derive(Default)]
-pub(crate) struct Selector<F: FieldExt>(Vec<AssignedCondition<F>>);
+pub(crate) struct Selector<F: PrimeField>(Vec<AssignedCondition<F>>);
 
-impl<F: FieldExt> fmt::Debug for Selector<F> {
+impl<F: PrimeField> fmt::Debug for Selector<F> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let mut debug = f.debug_struct("Selector");
         for (i, bit) in self.0.iter().enumerate() {
@@ -181,9 +181,9 @@ impl<F: FieldExt> fmt::Debug for Selector<F> {
 
 /// Vector of `Selectors` which represent the binary representation of a scalar
 /// split in window sized selectors.
-pub(crate) struct Windowed<F: FieldExt>(Vec<Selector<F>>);
+pub(crate) struct Windowed<F: PrimeField>(Vec<Selector<F>>);
 
-impl<F: FieldExt> fmt::Debug for Windowed<F> {
+impl<F: PrimeField> fmt::Debug for Windowed<F> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let mut debug = f.debug_struct("Window");
         for (i, selector) in self.0.iter().enumerate() {
@@ -198,13 +198,13 @@ impl<F: FieldExt> fmt::Debug for Windowed<F> {
 
 /// Table of precomputed values for efficient multiplication algorithm.
 pub(crate) struct Table<
-    W: FieldExt,
-    N: FieldExt,
+    W: PrimeField,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 >(pub(crate) Vec<AssignedPoint<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>>);
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize> fmt::Debug
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize> fmt::Debug
     for Table<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
@@ -223,8 +223,8 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
 /// Auxiliary points for efficient multiplication algorithm
 /// See: https://hackmd.io/ncuKqRXzR-Cw-Au2fGzsMg
 pub(super) struct MulAux<
-    W: FieldExt,
-    N: FieldExt,
+    W: PrimeField,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 > {
@@ -233,7 +233,7 @@ pub(super) struct MulAux<
 }
 
 /// Constructs `MulAux`
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     MulAux<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     pub(super) fn new(
diff --git a/ecc/src/general_ecc.rs b/ecc/src/general_ecc.rs
index 49e08cca..2d814142 100644
--- a/ecc/src/general_ecc.rs
+++ b/ecc/src/general_ecc.rs
@@ -3,9 +3,10 @@ use crate::halo2;
 use crate::integer::rns::{Integer, Rns};
 use crate::integer::{IntegerChip, IntegerInstructions, Range, UnassignedInteger};
 use crate::maingate;
-use halo2::arithmetic::{CurveAffine, FieldExt};
+use halo2::arithmetic::CurveAffine;
 use halo2::circuit::{Layouter, Value};
 use halo2::plonk::Error;
+use integer::halo2::ff::PrimeField;
 use integer::maingate::RegionCtx;
 use maingate::{AssignedCondition, MainGate};
 use std::collections::BTreeMap;
@@ -20,7 +21,7 @@ mod mul;
 #[allow(clippy::type_complexity)]
 pub struct GeneralEccChip<
     Emulated: CurveAffine,
-    N: FieldExt,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 > {
@@ -41,7 +42,7 @@ pub struct GeneralEccChip<
 
 impl<
         Emulated: CurveAffine,
-        N: FieldExt,
+        N: PrimeField,
         const NUMBER_OF_LIMBS: usize,
         const BIT_LEN_LIMB: usize,
     > GeneralEccChip<Emulated, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
@@ -158,7 +159,7 @@ impl<
 
 impl<
         Emulated: CurveAffine,
-        N: FieldExt,
+        N: PrimeField,
         const NUMBER_OF_LIMBS: usize,
         const BIT_LEN_LIMB: usize,
     > GeneralEccChip<Emulated, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
@@ -400,10 +401,11 @@ mod tests {
     use crate::integer::NUMBER_OF_LOOKUP_LIMBS;
     use crate::integer::{AssignedInteger, IntegerInstructions};
     use crate::maingate;
-    use group::{prime::PrimeCurveAffine, Curve as _, Group};
-    use halo2::arithmetic::{CurveAffine, FieldExt};
+    use halo2::arithmetic::CurveAffine;
     use halo2::circuit::{Layouter, SimpleFloorPlanner, Value};
     use halo2::plonk::{Circuit, ConstraintSystem, Error};
+    use integer::halo2::ff::{Field, FromUniformBytes, PrimeField, WithSmallOrderMulGroup};
+    use integer::halo2::group::{Curve, Group};
     use integer::rns::Integer;
     use integer::Range;
     use maingate::mock_prover_verify;
@@ -425,7 +427,7 @@ mod tests {
     #[allow(clippy::type_complexity)]
     fn setup<
         C: CurveAffine,
-        N: FieldExt,
+        N: PrimeField,
         const NUMBER_OF_LIMBS: usize,
         const BIT_LEN_LIMB: usize,
     >(
@@ -462,7 +464,7 @@ mod tests {
     impl TestCircuitConfig {
         fn new<
             C: CurveAffine,
-            N: FieldExt,
+            N: PrimeField,
             const NUMBER_OF_LIMBS: usize,
             const BIT_LEN_LIMB: usize,
         >(
@@ -490,7 +492,10 @@ mod tests {
             }
         }
 
-        fn config_range<N: FieldExt>(&self, layouter: &mut impl Layouter<N>) -> Result<(), Error> {
+        fn config_range<N: PrimeField>(
+            &self,
+            layouter: &mut impl Layouter<N>,
+        ) -> Result<(), Error> {
             let range_chip = RangeChip::<N>::new(self.range_config.clone());
             range_chip.load_table(layouter)?;
 
@@ -501,15 +506,19 @@ mod tests {
     #[derive(Clone, Debug, Default)]
     struct TestEccAddition<
         C: CurveAffine,
-        N: FieldExt,
+        N: PrimeField,
         const NUMBER_OF_LIMBS: usize,
         const BIT_LEN_LIMB: usize,
     > {
         _marker: PhantomData<(C, N)>,
     }
 
-    impl<C: CurveAffine, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
-        Circuit<N> for TestEccAddition<C, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
+    impl<
+            C: CurveAffine,
+            N: PrimeField,
+            const NUMBER_OF_LIMBS: usize,
+            const BIT_LEN_LIMB: usize,
+        > Circuit<N> for TestEccAddition<C, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
     {
         type Config = TestCircuitConfig;
         type FloorPlanner = SimpleFloorPlanner;
@@ -585,7 +594,7 @@ mod tests {
     fn test_general_ecc_addition_circuit() {
         fn run<
             C: CurveAffine,
-            N: FieldExt,
+            N: WithSmallOrderMulGroup<3> + FromUniformBytes<64> + Ord,
             const NUMBER_OF_LIMBS: usize,
             const BIT_LEN_LIMB: usize,
         >() {
@@ -614,7 +623,7 @@ mod tests {
     #[derive(Default, Clone, Debug)]
     struct TestEccPublicInput<
         C: CurveAffine,
-        N: FieldExt,
+        N: PrimeField,
         const NUMBER_OF_LIMBS: usize,
         const BIT_LEN_LIMB: usize,
     > {
@@ -623,8 +632,12 @@ mod tests {
         _marker: PhantomData<N>,
     }
 
-    impl<C: CurveAffine, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
-        Circuit<N> for TestEccPublicInput<C, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
+    impl<
+            C: CurveAffine,
+            N: PrimeField,
+            const NUMBER_OF_LIMBS: usize,
+            const BIT_LEN_LIMB: usize,
+        > Circuit<N> for TestEccPublicInput<C, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
     {
         type Config = TestCircuitConfig;
         type FloorPlanner = SimpleFloorPlanner;
@@ -686,7 +699,7 @@ mod tests {
     fn test_general_ecc_public_input() {
         fn run<
             C: CurveAffine,
-            N: FieldExt,
+            N: WithSmallOrderMulGroup<3> + FromUniformBytes<64> + Ord,
             const NUMBER_OF_LIMBS: usize,
             const BIT_LEN_LIMB: usize,
         >() {
@@ -731,7 +744,7 @@ mod tests {
     #[derive(Default, Clone, Debug)]
     struct TestEccMul<
         C: CurveAffine,
-        N: FieldExt,
+        N: PrimeField,
         const NUMBER_OF_LIMBS: usize,
         const BIT_LEN_LIMB: usize,
     > {
@@ -740,8 +753,12 @@ mod tests {
         _marker: PhantomData<N>,
     }
 
-    impl<C: CurveAffine, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
-        Circuit<N> for TestEccMul<C, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
+    impl<
+            C: CurveAffine,
+            N: PrimeField,
+            const NUMBER_OF_LIMBS: usize,
+            const BIT_LEN_LIMB: usize,
+        > Circuit<N> for TestEccMul<C, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
     {
         type Config = TestCircuitConfig;
         type FloorPlanner = SimpleFloorPlanner;
@@ -780,7 +797,6 @@ mod tests {
             layouter.assign_region(
                 || "region mul",
                 |region| {
-                    use group::ff::Field;
                     let offset = 0;
                     let ctx = &mut RegionCtx::new(region, offset);
 
@@ -814,7 +830,7 @@ mod tests {
     fn test_general_ecc_mul_circuit() {
         fn run<
             C: CurveAffine,
-            N: FieldExt,
+            N:  FromUniformBytes<64> + WithSmallOrderMulGroup<3> + Ord,
             const NUMBER_OF_LIMBS: usize,
             const BIT_LEN_LIMB: usize,
         >() {
@@ -851,7 +867,7 @@ mod tests {
     #[derive(Default, Clone, Debug)]
     struct TestEccBatchMul<
         C: CurveAffine,
-        N: FieldExt,
+        N: PrimeField,
         const NUMBER_OF_LIMBS: usize,
         const BIT_LEN_LIMB: usize,
     > {
@@ -861,8 +877,12 @@ mod tests {
         _marker: PhantomData<N>,
     }
 
-    impl<C: CurveAffine, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
-        Circuit<N> for TestEccBatchMul<C, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
+    impl<
+            C: CurveAffine,
+            N: PrimeField,
+            const NUMBER_OF_LIMBS: usize,
+            const BIT_LEN_LIMB: usize,
+        > Circuit<N> for TestEccBatchMul<C, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
     {
         type Config = TestCircuitConfig;
         type FloorPlanner = SimpleFloorPlanner;
@@ -902,7 +922,6 @@ mod tests {
             layouter.assign_region(
                 || "region mul",
                 |region| {
-                    use group::ff::Field;
                     let offset = 0;
                     let ctx = &mut RegionCtx::new(region, offset);
 
@@ -948,7 +967,7 @@ mod tests {
                 fn [<test_general_ecc_mul_batch_circuit_ $C:lower _ $N:lower>]() {
                     for number_of_pairs in 5..7 {
                         for window_size in 1..3 {
-                            let aux_generator = <$C as PrimeCurveAffine>::Curve::random(OsRng).to_affine();
+                            let aux_generator = <$C as CurveAffine>::CurveExt::random(OsRng).to_affine();
 
                             let circuit = TestEccBatchMul::<$C, $N, $NUMBER_OF_LIMBS, $BIT_LEN_LIMB> {
                                 aux_generator,
diff --git a/ecc/src/general_ecc/add.rs b/ecc/src/general_ecc/add.rs
index 3afa9bb8..f8eac6fd 100644
--- a/ecc/src/general_ecc/add.rs
+++ b/ecc/src/general_ecc/add.rs
@@ -1,14 +1,15 @@
 use super::AssignedPoint;
 use super::GeneralEccChip;
 use crate::halo2;
-use halo2::arithmetic::{CurveAffine, FieldExt};
+use halo2::arithmetic::CurveAffine;
 use halo2::plonk::Error;
+use integer::halo2::ff::PrimeField;
 use integer::maingate::RegionCtx;
 use integer::IntegerInstructions;
 
 impl<
         Emulated: CurveAffine,
-        N: FieldExt,
+        N: PrimeField,
         const NUMBER_OF_LIMBS: usize,
         const BIT_LEN_LIMB: usize,
     > GeneralEccChip<Emulated, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
diff --git a/ecc/src/general_ecc/mul.rs b/ecc/src/general_ecc/mul.rs
index da12a01b..e8185ad4 100644
--- a/ecc/src/general_ecc/mul.rs
+++ b/ecc/src/general_ecc/mul.rs
@@ -2,14 +2,14 @@ use super::{AssignedPoint, GeneralEccChip};
 use crate::integer::{AssignedInteger, IntegerInstructions};
 use crate::maingate::{AssignedCondition, MainGateInstructions};
 use crate::{halo2, Selector, Table, Windowed};
-use group::ff::PrimeField;
-use halo2::arithmetic::{CurveAffine, FieldExt};
+use halo2::arithmetic::CurveAffine;
 use halo2::plonk::Error;
+use integer::halo2::ff::PrimeField;
 use integer::maingate::RegionCtx;
 
 impl<
         Emulated: CurveAffine,
-        N: FieldExt,
+        N: PrimeField,
         const NUMBER_OF_LIMBS: usize,
         const BIT_LEN_LIMB: usize,
     > GeneralEccChip<Emulated, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
@@ -27,7 +27,7 @@ impl<
         // shorter ending window.
         let padding_offset = (window_size - (bits.len() % window_size)) % window_size;
         let zeros: Vec<AssignedCondition<N>> = (0..padding_offset)
-            .map(|_| self.main_gate().assign_constant(region, N::zero()))
+            .map(|_| self.main_gate().assign_constant(region, N::ZERO))
             .collect::<Result<_, Error>>()?;
         bits.extend(zeros);
         bits.reverse();
diff --git a/ecc/src/lib.rs b/ecc/src/lib.rs
index 2f81443b..0c424358 100644
--- a/ecc/src/lib.rs
+++ b/ecc/src/lib.rs
@@ -13,17 +13,18 @@ pub mod general_ecc;
 
 pub use integer;
 pub use integer::halo2;
+use integer::halo2::ff::PrimeField;
 pub use integer::maingate;
 
 #[cfg(test)]
 use halo2::halo2curves as curves;
 
-use crate::halo2::arithmetic::{CurveAffine, FieldExt};
+use crate::halo2::arithmetic::CurveAffine;
 use crate::integer::chip::IntegerConfig;
 use crate::integer::rns::{Integer, Rns};
 use crate::integer::AssignedInteger;
 use crate::maingate::{big_to_fe, AssignedCondition, MainGateConfig, RangeConfig};
-use group::Curve;
+use integer::halo2::group::Curve;
 use num_bigint::BigUint as big_uint;
 use num_traits::One;
 use std::fmt;
@@ -31,13 +32,17 @@ use std::rc::Rc;
 
 /// Represent a Point in affine coordinates
 #[derive(Clone, Debug)]
-pub struct Point<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
-{
+pub struct Point<
+    W: PrimeField,
+    N: PrimeField,
+    const NUMBER_OF_LIMBS: usize,
+    const BIT_LEN_LIMB: usize,
+> {
     x: Integer<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>,
     y: Integer<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>,
 }
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     Point<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     /// Returns `Point` form a point in a EC with W as its base field
@@ -77,8 +82,8 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
 #[derive(Clone)]
 /// point that is assumed to be on curve and not infinity
 pub struct AssignedPoint<
-    W: FieldExt,
-    N: FieldExt,
+    W: PrimeField,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 > {
@@ -86,8 +91,8 @@ pub struct AssignedPoint<
     pub(crate) y: AssignedInteger<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>,
 }
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize> fmt::Debug
-    for AssignedPoint<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+    fmt::Debug for AssignedPoint<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_struct("AssignedPoint")
@@ -98,7 +103,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
     }
 }
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     AssignedPoint<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     /// Returns a new `AssignedPoint` given its coordinates as `AssignedInteger`
@@ -152,7 +157,6 @@ impl EccConfig {
 fn make_mul_aux<C: CurveAffine>(aux_to_add: C, window_size: usize, number_of_pairs: usize) -> C {
     assert!(window_size > 0);
     assert!(number_of_pairs > 0);
-    use group::ff::PrimeField;
 
     let n = C::Scalar::NUM_BITS as usize;
     let mut number_of_selectors = n / window_size;
@@ -176,9 +180,9 @@ fn make_mul_aux<C: CurveAffine>(aux_to_add: C, window_size: usize, number_of_pai
 /// Allows to select values of precomputed table in efficient multiplication
 /// algorithm
 #[derive(Default)]
-pub(crate) struct Selector<F: FieldExt>(Vec<AssignedCondition<F>>);
+pub(crate) struct Selector<F: PrimeField>(Vec<AssignedCondition<F>>);
 
-impl<F: FieldExt> fmt::Debug for Selector<F> {
+impl<F: PrimeField> fmt::Debug for Selector<F> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let mut debug = f.debug_struct("Selector");
         for (i, bit) in self.0.iter().enumerate() {
@@ -191,9 +195,9 @@ impl<F: FieldExt> fmt::Debug for Selector<F> {
 
 /// Vector of `Selectors` which represent the binary representation of a scalar
 /// split in window sized selectors.
-pub(crate) struct Windowed<F: FieldExt>(Vec<Selector<F>>);
+pub(crate) struct Windowed<F: PrimeField>(Vec<Selector<F>>);
 
-impl<F: FieldExt> fmt::Debug for Windowed<F> {
+impl<F: PrimeField> fmt::Debug for Windowed<F> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let mut debug = f.debug_struct("Window");
         for (i, selector) in self.0.iter().enumerate() {
@@ -208,14 +212,14 @@ impl<F: FieldExt> fmt::Debug for Windowed<F> {
 
 /// Table of precomputed values for efficient multiplication algorithm.
 pub(crate) struct Table<
-    W: FieldExt,
-    N: FieldExt,
+    W: PrimeField,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 >(pub(crate) Vec<AssignedPoint<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>>);
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize> fmt::Debug
-    for Table<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+    fmt::Debug for Table<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let mut debug = f.debug_struct("Table");
@@ -232,13 +236,14 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
 
 /// Auxiliary points for efficient multiplication algorithm
 /// See: https://hackmd.io/ncuKqRXzR-Cw-Au2fGzsMg
-struct MulAux<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize> {
+struct MulAux<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+{
     to_add: AssignedPoint<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>,
     to_sub: AssignedPoint<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>,
 }
 
 /// Constructs `MulAux`
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     MulAux<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     fn new(
diff --git a/ecdsa/Cargo.toml b/ecdsa/Cargo.toml
index 7a2b2bff..a1711360 100644
--- a/ecdsa/Cargo.toml
+++ b/ecdsa/Cargo.toml
@@ -9,7 +9,6 @@ num-bigint = { version = "0.4", features = ["rand"] }
 num-integer = "0.1"
 num-traits = "0.2"
 rand = "0.8"
-group = "0.12"
 subtle = { version = "2.3", default-features = false }
 
 [dev-dependencies]
diff --git a/ecdsa/src/ecdsa.rs b/ecdsa/src/ecdsa.rs
index c93601fb..2a250ada 100644
--- a/ecdsa/src/ecdsa.rs
+++ b/ecdsa/src/ecdsa.rs
@@ -2,10 +2,10 @@ use super::integer::{IntegerChip, IntegerConfig};
 use crate::halo2;
 use crate::integer;
 use crate::maingate;
-use ecc::maingate::MainGateInstructions;
+use ecc::halo2::ff::PrimeField;
 use ecc::maingate::RegionCtx;
 use ecc::{AssignedPoint, EccConfig, GeneralEccChip};
-use halo2::arithmetic::{CurveAffine, FieldExt};
+use halo2::arithmetic::CurveAffine;
 use halo2::{circuit::Value, plonk::Error};
 use integer::rns::Integer;
 use integer::{AssignedInteger, IntegerInstructions};
@@ -36,8 +36,8 @@ impl EcdsaConfig {
 
 #[derive(Clone, Debug)]
 pub struct EcdsaSig<
-    W: FieldExt,
-    N: FieldExt,
+    W: PrimeField,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 > {
@@ -46,8 +46,8 @@ pub struct EcdsaSig<
 }
 
 pub struct AssignedEcdsaSig<
-    W: FieldExt,
-    N: FieldExt,
+    W: PrimeField,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 > {
@@ -56,8 +56,8 @@ pub struct AssignedEcdsaSig<
 }
 
 pub struct AssignedPublicKey<
-    W: FieldExt,
-    N: FieldExt,
+    W: PrimeField,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 > {
@@ -66,12 +66,12 @@ pub struct AssignedPublicKey<
 
 pub struct EcdsaChip<
     E: CurveAffine,
-    N: FieldExt,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 >(GeneralEccChip<E, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>);
 
-impl<E: CurveAffine, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<E: CurveAffine, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     EcdsaChip<E, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     pub fn new(ecc_chip: GeneralEccChip<E, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>) -> Self {
@@ -89,7 +89,7 @@ impl<E: CurveAffine, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LI
     }
 }
 
-impl<E: CurveAffine, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<E: CurveAffine, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     EcdsaChip<E, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     pub fn verify(
@@ -143,16 +143,18 @@ mod tests {
     use crate::halo2;
     use crate::integer;
     use crate::maingate;
+    use ecc::halo2::ff::FromUniformBytes;
+    use ecc::halo2::ff::WithSmallOrderMulGroup;
+    use ecc::halo2::group::Curve;
+    use ecc::halo2::group::Group;
     use ecc::integer::Range;
     use ecc::maingate::big_to_fe;
     use ecc::maingate::fe_to_big;
     use ecc::maingate::RegionCtx;
     use ecc::{EccConfig, GeneralEccChip};
-    use group::ff::Field;
-    use group::{Curve, Group};
     use halo2::arithmetic::CurveAffine;
-    use halo2::arithmetic::FieldExt;
     use halo2::circuit::{Layouter, SimpleFloorPlanner, Value};
+    use halo2::ff::{Field, PrimeField};
     use halo2::plonk::{Circuit, ConstraintSystem, Error};
     use integer::IntegerInstructions;
     use maingate::mock_prover_verify;
@@ -170,7 +172,7 @@ mod tests {
     }
 
     impl TestCircuitEcdsaVerifyConfig {
-        pub fn new<C: CurveAffine, N: FieldExt>(meta: &mut ConstraintSystem<N>) -> Self {
+        pub fn new<C: CurveAffine, N: PrimeField>(meta: &mut ConstraintSystem<N>) -> Self {
             let (rns_base, rns_scalar) =
                 GeneralEccChip::<C, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>::rns();
             let main_gate_config = MainGate::<N>::configure(meta);
@@ -195,7 +197,7 @@ mod tests {
             EccConfig::new(self.range_config.clone(), self.main_gate_config.clone())
         }
 
-        pub fn config_range<N: FieldExt>(
+        pub fn config_range<N: PrimeField>(
             &self,
             layouter: &mut impl Layouter<N>,
         ) -> Result<(), Error> {
@@ -207,7 +209,7 @@ mod tests {
     }
 
     #[derive(Default, Clone)]
-    struct TestCircuitEcdsaVerify<E: CurveAffine, N: FieldExt> {
+    struct TestCircuitEcdsaVerify<E: CurveAffine, N: PrimeField> {
         public_key: Value<E>,
         signature: Value<(E::Scalar, E::Scalar)>,
         msg_hash: Value<E::Scalar>,
@@ -217,7 +219,7 @@ mod tests {
         _marker: PhantomData<N>,
     }
 
-    impl<E: CurveAffine, N: FieldExt> Circuit<N> for TestCircuitEcdsaVerify<E, N> {
+    impl<E: CurveAffine, N: PrimeField> Circuit<N> for TestCircuitEcdsaVerify<E, N> {
         type Config = TestCircuitEcdsaVerifyConfig;
         type FloorPlanner = SimpleFloorPlanner;
 
@@ -296,7 +298,10 @@ mod tests {
             big_to_fe(x_big)
         }
 
-        fn run<C: CurveAffine, N: FieldExt>() {
+        fn run<
+            C: CurveAffine,
+            N: WithSmallOrderMulGroup<3> + FromUniformBytes<64> + Ord,
+        >() {
             let g = C::generator();
 
             // Generate a key pair
diff --git a/halo2wrong/Cargo.toml b/halo2wrong/Cargo.toml
index f3bd12ef..9a53d4dc 100644
--- a/halo2wrong/Cargo.toml
+++ b/halo2wrong/Cargo.toml
@@ -9,7 +9,6 @@ num-bigint = { version = "0.4", features = ["rand"] }
 num-integer = "0.1"
 num-traits = "0.2"
 halo2 = { package = "halo2_proofs", git = "https://github.com/privacy-scaling-explorations/halo2", tag = "v2023_02_02" }
-group = "0.12"
 
 [dev-dependencies]
 rand = "0.8"
diff --git a/halo2wrong/src/lib.rs b/halo2wrong/src/lib.rs
index 7d3ddecb..b5578adf 100644
--- a/halo2wrong/src/lib.rs
+++ b/halo2wrong/src/lib.rs
@@ -1,6 +1,6 @@
 use halo2::{
-    arithmetic::FieldExt,
     circuit::{AssignedCell, Cell, Region, Value},
+    ff::PrimeField,
     plonk::{Advice, Column, Error, Fixed, Selector},
 };
 
@@ -9,12 +9,12 @@ pub use halo2;
 pub use halo2::halo2curves as curves;
 
 #[derive(Debug)]
-pub struct RegionCtx<'a, F: FieldExt> {
+pub struct RegionCtx<'a, F: PrimeField> {
     region: Region<'a, F>,
     offset: usize,
 }
 
-impl<'a, F: FieldExt> RegionCtx<'a, F> {
+impl<'a, F: PrimeField> RegionCtx<'a, F> {
     pub fn new(region: Region<'a, F>, offset: usize) -> RegionCtx<'a, F> {
         RegionCtx { region, offset }
     }
diff --git a/halo2wrong/src/utils.rs b/halo2wrong/src/utils.rs
index d0401ffe..408f2806 100644
--- a/halo2wrong/src/utils.rs
+++ b/halo2wrong/src/utils.rs
@@ -1,5 +1,4 @@
 use crate::halo2::{
-    arithmetic::FieldExt,
     circuit::Value,
     dev::MockProver,
     plonk::{
@@ -7,7 +6,10 @@ use crate::halo2::{
         FloorPlanner, Instance, Selector,
     },
 };
-use halo2::plonk::Challenge;
+use halo2::{
+    ff::{FromUniformBytes, PrimeField, WithSmallOrderMulGroup},
+    plonk::Challenge,
+};
 use num_bigint::BigUint as big_uint;
 use num_traits::{Num, One, Zero};
 use std::{
@@ -15,29 +17,29 @@ use std::{
     ops::{RangeInclusive, Shl},
 };
 
-pub fn modulus<F: FieldExt>() -> big_uint {
+pub fn modulus<F: PrimeField>() -> big_uint {
     big_uint::from_str_radix(&F::MODULUS[2..], 16).unwrap()
 }
 
-pub fn power_of_two<F: FieldExt>(n: usize) -> F {
+pub fn power_of_two<F: PrimeField>(n: usize) -> F {
     big_to_fe(big_uint::one() << n)
 }
 
-pub fn big_to_fe<F: FieldExt>(e: big_uint) -> F {
+pub fn big_to_fe<F: PrimeField>(e: big_uint) -> F {
     let modulus = modulus::<F>();
     let e = e % modulus;
     F::from_str_vartime(&e.to_str_radix(10)[..]).unwrap()
 }
 
-pub fn fe_to_big<F: FieldExt>(fe: F) -> big_uint {
+pub fn fe_to_big<F: PrimeField>(fe: F) -> big_uint {
     big_uint::from_bytes_le(fe.to_repr().as_ref())
 }
 
-pub fn decompose<F: FieldExt>(e: F, number_of_limbs: usize, bit_len: usize) -> Vec<F> {
+pub fn decompose<F: PrimeField>(e: F, number_of_limbs: usize, bit_len: usize) -> Vec<F> {
     decompose_big(fe_to_big(e), number_of_limbs, bit_len)
 }
 
-pub fn decompose_big<F: FieldExt>(e: big_uint, number_of_limbs: usize, bit_len: usize) -> Vec<F> {
+pub fn decompose_big<F: PrimeField>(e: big_uint, number_of_limbs: usize, bit_len: usize) -> Vec<F> {
     let mut e = e;
     let mask = big_uint::from(1usize).shl(bit_len) - 1usize;
     let limbs: Vec<F> = (0..number_of_limbs)
@@ -63,7 +65,14 @@ pub fn compose(input: Vec<big_uint>, bit_len: usize) -> big_uint {
         .fold(big_uint::zero(), |acc, val| (acc << bit_len) + val)
 }
 
-pub fn mock_prover_verify<F: FieldExt, C: Circuit<F>>(circuit: &C, instance: Vec<Vec<F>>) {
+
+pub fn mock_prover_verify<
+    F: WithSmallOrderMulGroup<3> + FromUniformBytes<64> + Ord,
+    C: Circuit<F>,
+>(
+    circuit: &C,
+    instance: Vec<Vec<F>>,
+)  {
     let dimension = DimensionMeasurement::measure(circuit).unwrap();
     let prover = MockProver::run(dimension.k(), circuit, instance)
         .unwrap_or_else(|err| panic!("{:#?}", err));
@@ -118,7 +127,7 @@ impl DimensionMeasurement {
         }
     }
 
-    pub fn measure<F: FieldExt, C: Circuit<F>>(circuit: &C) -> Result<Dimension, Error> {
+    pub fn measure<F: PrimeField, C: Circuit<F>>(circuit: &C) -> Result<Dimension, Error> {
         let mut cs = ConstraintSystem::default();
         let config = C::configure(&mut cs);
         let mut measurement = Self::default();
@@ -132,7 +141,7 @@ impl DimensionMeasurement {
     }
 }
 
-impl<F: FieldExt> Assignment<F> for DimensionMeasurement {
+impl<F: PrimeField> Assignment<F> for DimensionMeasurement {
     fn enter_region<NR, N>(&mut self, _: N)
     where
         NR: Into<String>,
@@ -140,6 +149,13 @@ impl<F: FieldExt> Assignment<F> for DimensionMeasurement {
     {
     }
 
+    fn annotate_column<A, AR>(&mut self, _annotation: A, _column: Column<Any>)
+    where
+        A: FnOnce() -> AR,
+        AR: Into<String>,
+    {
+    }
+
     fn exit_region(&mut self) {}
 
     fn get_challenge(&self, _challenge: Challenge) -> Value<F> {
@@ -160,14 +176,6 @@ impl<F: FieldExt> Assignment<F> for DimensionMeasurement {
         Ok(Value::unknown())
     }
 
-    fn annotate_column<A, AR>(&mut self, _annotation: A, _column: Column<Any>)
-    where
-        A: FnOnce() -> AR,
-        AR: Into<String>,
-    {
-        // Do nothing.
-    }
-
     fn assign_advice<V, VR, A, AR>(
         &mut self,
         _: A,
@@ -237,7 +245,7 @@ impl<F: FieldExt> Assignment<F> for DimensionMeasurement {
 #[test]
 fn test_round_trip() {
     use crate::curves::pasta::Fp;
-    use group::ff::Field as _;
+    use halo2::ff::Field as _;
     use num_bigint::RandomBits;
     use rand::Rng;
     use rand_core::OsRng;
@@ -286,7 +294,7 @@ fn test_dimension_measurement() {
     #[derive(Default)]
     struct TestCircuit<F>(PhantomData<F>);
 
-    impl<F: FieldExt> Circuit<F> for TestCircuit<F> {
+    impl<F: PrimeField> Circuit<F> for TestCircuit<F> {
         type Config = (Column<Instance>, Column<Fixed>, [Column<Advice>; 2]);
         type FloorPlanner = V1;
 
@@ -311,7 +319,7 @@ fn test_dimension_measurement() {
                 || "",
                 |mut region| {
                     for i in 0..15 {
-                        region.assign_fixed(|| "", f0, i, || Value::known(F::zero()))?;
+                        region.assign_fixed(|| "", f0, i, || Value::known(F::ZERO))?;
                     }
                     Ok(())
                 },
@@ -320,7 +328,7 @@ fn test_dimension_measurement() {
                 || "",
                 |mut region| {
                     for i in 0..10 {
-                        region.assign_advice(|| "", a0, i, || Value::known(F::zero()))?;
+                        region.assign_advice(|| "", a0, i, || Value::known(F::ZERO))?;
                     }
                     Ok(())
                 },
@@ -329,7 +337,7 @@ fn test_dimension_measurement() {
                 || "",
                 |mut region| {
                     for i in 0..20 {
-                        region.assign_advice(|| "", a1, i, || Value::known(F::zero()))?;
+                        region.assign_advice(|| "", a1, i, || Value::known(F::ZERO))?;
                     }
                     Ok(())
                 },
@@ -341,7 +349,7 @@ fn test_dimension_measurement() {
                     for i in 0..20 {
                         cell = Some(
                             region
-                                .assign_advice(|| "", a0, i, || Value::known(F::zero()))?
+                                .assign_advice(|| "", a0, i, || Value::known(F::ZERO))?
                                 .cell(),
                         );
                     }
diff --git a/integer/Cargo.toml b/integer/Cargo.toml
index 03dd971c..428304b4 100644
--- a/integer/Cargo.toml
+++ b/integer/Cargo.toml
@@ -10,7 +10,6 @@ num-bigint = { version = "0.4", features = ["rand"] }
 num-integer = "0.1"
 num-traits = "0.2"
 rand = "0.8"
-group = "0.12"
 subtle = { version = "2.3", default-features = false }
 
 [dev-dependencies]
diff --git a/integer/src/chip.rs b/integer/src/chip.rs
index 666bfa7e..d341bf5c 100644
--- a/integer/src/chip.rs
+++ b/integer/src/chip.rs
@@ -3,8 +3,8 @@ use std::rc::Rc;
 use super::{AssignedInteger, AssignedLimb, UnassignedInteger};
 use crate::instructions::{IntegerInstructions, Range};
 use crate::rns::{Common, Integer, Rns};
-use halo2::arithmetic::FieldExt;
 use halo2::plonk::Error;
+use maingate::halo2::ff::PrimeField;
 use maingate::{halo2, AssignedCondition, AssignedValue, MainGateInstructions, RegionCtx};
 use maingate::{MainGate, MainGateConfig};
 use maingate::{RangeChip, RangeConfig};
@@ -43,8 +43,8 @@ impl IntegerConfig {
 /// Chip for integer instructions
 #[derive(Clone, Debug)]
 pub struct IntegerChip<
-    W: FieldExt,
-    N: FieldExt,
+    W: PrimeField,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 > {
@@ -56,7 +56,7 @@ pub struct IntegerChip<
     rns: Rc<Rns<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>>,
 }
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     IntegerChip<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     fn sublimb_bit_len() -> usize {
@@ -76,11 +76,11 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
     }
 }
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     IntegerInstructions<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
     for IntegerChip<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
-    fn reduce_external<T: FieldExt>(
+    fn reduce_external<T: PrimeField>(
         &self,
         ctx: &mut RegionCtx<'_, N>,
         // TODO: external integer might have different parameter settings
@@ -519,7 +519,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
     }
 }
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     IntegerChip<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     /// Create new ['IntegerChip'] with the configuration and a shared [`Rns`]
@@ -551,7 +551,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
 mod tests {
     use super::{IntegerChip, IntegerConfig, IntegerInstructions, Range};
     use crate::rns::{Common, Integer, Rns};
-    use crate::{FieldExt, UnassignedInteger};
+    use crate::{PrimeField, UnassignedInteger};
     use halo2::circuit::{Layouter, SimpleFloorPlanner, Value};
     use halo2::plonk::{Circuit, ConstraintSystem, Error};
     use maingate::mock_prover_verify;
@@ -566,19 +566,19 @@ mod tests {
 
     const NUMBER_OF_LIMBS: usize = 4;
 
-    fn rns<W: FieldExt, N: FieldExt, const BIT_LEN_LIMB: usize>(
+    fn rns<W: PrimeField, N: PrimeField, const BIT_LEN_LIMB: usize>(
     ) -> Rns<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB> {
         Rns::<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>::construct()
     }
 
-    fn setup<W: FieldExt, N: FieldExt, const BIT_LEN_LIMB: usize>(
+    fn setup<W: PrimeField, N: PrimeField, const BIT_LEN_LIMB: usize>(
     ) -> (Rns<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>, u32) {
         let rns = rns();
         let k: u32 = (rns.bit_len_lookup + 1) as u32;
         (rns, k)
     }
 
-    impl<W: FieldExt, N: FieldExt, const BIT_LEN_LIMB: usize>
+    impl<W: PrimeField, N: PrimeField, const BIT_LEN_LIMB: usize>
         From<Integer<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>>
         for UnassignedInteger<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
     {
@@ -587,11 +587,11 @@ mod tests {
         }
     }
 
-    pub(crate) struct TestRNS<W: FieldExt, N: FieldExt, const BIT_LEN_LIMB: usize> {
+    pub(crate) struct TestRNS<W: PrimeField, N: PrimeField, const BIT_LEN_LIMB: usize> {
         rns: Rc<Rns<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>>,
     }
 
-    impl<W: FieldExt, N: FieldExt, const BIT_LEN_LIMB: usize> TestRNS<W, N, BIT_LEN_LIMB> {
+    impl<W: PrimeField, N: PrimeField, const BIT_LEN_LIMB: usize> TestRNS<W, N, BIT_LEN_LIMB> {
         pub(crate) fn rand_in_field(&self) -> Integer<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB> {
             Integer::from_fe(W::random(OsRng), Rc::clone(&self.rns))
         }
@@ -673,7 +673,7 @@ mod tests {
     }
 
     impl TestCircuitConfig {
-        fn new<W: FieldExt, N: FieldExt, const BIT_LEN_LIMB: usize>(
+        fn new<W: PrimeField, N: PrimeField, const BIT_LEN_LIMB: usize>(
             meta: &mut ConstraintSystem<N>,
         ) -> Self {
             let main_gate_config = MainGate::<N>::configure(meta);
@@ -701,7 +701,10 @@ mod tests {
             }
         }
 
-        fn config_range<N: FieldExt>(&self, layouter: &mut impl Layouter<N>) -> Result<(), Error> {
+        fn config_range<N: PrimeField>(
+            &self,
+            layouter: &mut impl Layouter<N>,
+        ) -> Result<(), Error> {
             let range_chip = RangeChip::<N>::new(self.range_config.clone());
             range_chip.load_table(layouter)?;
 
@@ -714,11 +717,11 @@ mod tests {
 
 
             #[derive(Clone, Debug)]
-            struct $circuit_name<W: FieldExt, N: FieldExt, const BIT_LEN_LIMB: usize> {
+            struct $circuit_name<W: PrimeField, N: PrimeField, const BIT_LEN_LIMB: usize> {
                 rns: Rc<Rns<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>>,
             }
 
-            impl<W: FieldExt, N: FieldExt,  const BIT_LEN_LIMB: usize> $circuit_name<W, N, BIT_LEN_LIMB> {
+            impl<W: PrimeField, N: PrimeField,  const BIT_LEN_LIMB: usize> $circuit_name<W, N, BIT_LEN_LIMB> {
                 fn integer_chip(&self, config:TestCircuitConfig) -> IntegerChip<W, N, NUMBER_OF_LIMBS,BIT_LEN_LIMB>{
                     IntegerChip::<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>::new(config.integer_chip_config(), Rc::clone(&self.rns))
                 }
@@ -729,7 +732,7 @@ mod tests {
 
             }
 
-            impl<W: FieldExt, N: FieldExt,  const BIT_LEN_LIMB: usize> Circuit<N> for $circuit_name<W, N, BIT_LEN_LIMB> {
+            impl<W: PrimeField, N: PrimeField,  const BIT_LEN_LIMB: usize> Circuit<N> for $circuit_name<W, N, BIT_LEN_LIMB> {
                 type Config = TestCircuitConfig;
                 type FloorPlanner = SimpleFloorPlanner;
 
@@ -1367,7 +1370,7 @@ mod tests {
 
                     let a = t.rand_in_remainder_range().into();
                     let b = t.rand_in_remainder_range().into();
-                    let cond = N::zero();
+                    let cond = N::ZERO;
                     let cond = Value::known(cond);
 
                     let a = integer_chip.assign_integer(ctx, a, Range::Remainder)?;
@@ -1383,7 +1386,7 @@ mod tests {
 
                     let a = t.rand_in_remainder_range().into();
                     let b = t.rand_in_remainder_range().into();
-                    let cond = N::one();
+                    let cond = N::ONE;
                     let cond = Value::known(cond);
 
                     let a = integer_chip.assign_integer(ctx, a, Range::Remainder)?;
@@ -1399,7 +1402,7 @@ mod tests {
 
                     let a = t.rand_in_remainder_range().into();
                     let b = t.rand_in_remainder_range();
-                    let cond = N::zero();
+                    let cond = N::ZERO;
                     let cond = Value::known(cond);
 
                     let a = integer_chip.assign_integer(ctx, a, Range::Remainder)?;
@@ -1415,7 +1418,7 @@ mod tests {
 
                     let a = t.rand_in_remainder_range().into();
                     let b = t.rand_in_remainder_range();
-                    let cond = N::one();
+                    let cond = N::ONE;
                     let cond = Value::known(cond);
 
                     let a = integer_chip.assign_integer(ctx, a, Range::Remainder)?;
@@ -1460,7 +1463,7 @@ mod tests {
                         );
                         assert_eq!(expected.len(), decomposed.len());
                         for (c, expected) in decomposed.iter().zip(expected.into_iter()) {
-                            if expected != W::zero() {
+                            if expected != W::ZERO {
                                 main_gate.assert_one(ctx, c)?;
                             } else {
                                 main_gate.assert_zero(ctx, c)?;
diff --git a/integer/src/chip/add.rs b/integer/src/chip/add.rs
index 3fb3e5cd..10e859f6 100644
--- a/integer/src/chip/add.rs
+++ b/integer/src/chip/add.rs
@@ -1,12 +1,12 @@
 use crate::chip::IntegerChip;
 use crate::rns::Integer;
-use crate::{AssignedInteger, AssignedLimb, Common, FieldExt};
+use crate::{AssignedInteger, AssignedLimb, Common, PrimeField};
 use halo2::plonk::Error;
 use maingate::{fe_to_big, halo2, MainGateInstructions, RegionCtx, Term};
 use num_bigint::BigUint as big_uint;
 use std::rc::Rc;
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     IntegerChip<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     pub(super) fn add_generic(
@@ -56,7 +56,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
                         Term::assigned_to_add(&b_limb_0.into()),
                         Term::assigned_to_add(&b_limb_1.into()),
                     ],
-                    N::zero(),
+                    N::ZERO,
                 )?;
                 Ok(AssignedLimb::from(c_limb, c_max))
             })
@@ -70,7 +70,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
                 Term::assigned_to_add(b_0.native()),
                 Term::assigned_to_add(b_1.native()),
             ],
-            N::zero(),
+            N::ZERO,
         )?;
         Ok(self.new_assigned_integer(&c_limbs, c_native))
     }
diff --git a/integer/src/chip/assert_in_field.rs b/integer/src/chip/assert_in_field.rs
index be044e83..f3feded1 100644
--- a/integer/src/chip/assert_in_field.rs
+++ b/integer/src/chip/assert_in_field.rs
@@ -1,11 +1,11 @@
 use super::{IntegerChip, Range};
-use crate::{AssignedInteger, FieldExt};
+use crate::{AssignedInteger, PrimeField};
 use halo2::plonk::Error;
 use maingate::{
     halo2, AssignedValue, CombinationOptionCommon, MainGateInstructions, RegionCtx, Term,
 };
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     IntegerChip<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     pub(super) fn assert_in_field_generic(
@@ -35,13 +35,13 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
         let borrow = comparision_witness.as_ref().map(|r| r.borrow);
         let borrow = (0..NUMBER_OF_LIMBS - 1)
             .map(|i| {
-                let b_i = borrow.map(|borrow| if borrow[i] { N::one() } else { N::zero() });
+                let b_i = borrow.map(|borrow| if borrow[i] { N::ONE } else { N::ZERO });
                 main_gate.assign_bit(ctx, b_i)
             })
             .collect::<Result<Vec<AssignedValue<N>>, Error>>()?;
 
         let left_shifter = self.rns.left_shifter(1);
-        let one = N::one();
+        let one = N::ONE;
 
         // Witness layout:
         // | A   | B   | C   | D       |
diff --git a/integer/src/chip/assert_not_zero.rs b/integer/src/chip/assert_not_zero.rs
index 2a596a6b..68042303 100644
--- a/integer/src/chip/assert_not_zero.rs
+++ b/integer/src/chip/assert_not_zero.rs
@@ -1,11 +1,11 @@
 use super::IntegerChip;
-use crate::{AssignedInteger, FieldExt};
+use crate::{AssignedInteger, PrimeField};
 use halo2::plonk::Error;
 use maingate::{halo2, CombinationOptionCommon, MainGateInstructions, RegionCtx, Term};
 use num_bigint::BigUint as big_uint;
 use std::convert::TryInto;
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     IntegerChip<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     pub(super) fn assert_not_zero_generic(
@@ -14,7 +14,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
         a: &AssignedInteger<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>,
     ) -> Result<(), Error> {
         let main_gate = self.main_gate();
-        let one = N::one();
+        let one = N::ONE;
 
         // Reduce result (r) is restricted to be less than 1 <<
         // wrong_modulus_bit_lenght, so we only need to assert r <> 0 and r <>
diff --git a/integer/src/chip/assert_zero.rs b/integer/src/chip/assert_zero.rs
index 81233672..dcc95c57 100644
--- a/integer/src/chip/assert_zero.rs
+++ b/integer/src/chip/assert_zero.rs
@@ -1,11 +1,11 @@
 use super::IntegerChip;
 use crate::rns::MaybeReduced;
-use crate::{AssignedInteger, FieldExt};
+use crate::{AssignedInteger, PrimeField};
 use halo2::plonk::Error;
 
 use maingate::{halo2, AssignedValue, MainGateInstructions, RangeInstructions, RegionCtx, Term};
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     IntegerChip<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     pub(super) fn assert_zero_generic(
@@ -14,7 +14,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
         a: &AssignedInteger<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>,
     ) -> Result<(), Error> {
         let main_gate = self.main_gate();
-        let (zero, one) = (N::zero(), N::one());
+        let (zero, one) = (N::ZERO, N::ONE);
 
         let witness: MaybeReduced<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB> =
             a.integer().as_ref().map(|a_int| a_int.reduce()).into();
diff --git a/integer/src/chip/assign.rs b/integer/src/chip/assign.rs
index f3f2c72c..2a42c348 100644
--- a/integer/src/chip/assign.rs
+++ b/integer/src/chip/assign.rs
@@ -1,14 +1,14 @@
 use super::{IntegerChip, Range};
 use crate::rns::{Common, Integer};
 use crate::{AssignedInteger, AssignedLimb, UnassignedInteger};
-use halo2::arithmetic::FieldExt;
 use halo2::plonk::Error;
+use maingate::halo2::ff::PrimeField;
 use maingate::{fe_to_big, halo2, MainGateInstructions, RangeInstructions, RegionCtx, Term};
 use num_bigint::BigUint as big_uint;
 use num_traits::One;
 use std::rc::Rc;
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     IntegerChip<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     pub(super) fn assign_integer_generic(
@@ -85,7 +85,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
             .zip(self.rns.left_shifters.iter())
             .map(|(limb, sh)| Term::Assigned(limb.as_ref(), *sh))
             .collect();
-        let native = main_gate.compose(ctx, &limbs_to_compose, N::zero())?;
+        let native = main_gate.compose(ctx, &limbs_to_compose, N::ZERO)?;
 
         Ok(self.new_assigned_integer(&limbs.try_into().unwrap(), native))
     }
diff --git a/integer/src/chip/div.rs b/integer/src/chip/div.rs
index 69ffe6c8..6171392e 100644
--- a/integer/src/chip/div.rs
+++ b/integer/src/chip/div.rs
@@ -1,13 +1,13 @@
 use super::{IntegerChip, IntegerInstructions, Range};
 use crate::rns::MaybeReduced;
-use crate::{AssignedInteger, FieldExt};
+use crate::{AssignedInteger, PrimeField};
 use halo2::{arithmetic::Field, plonk::Error};
 use maingate::{
     halo2, AssignedCondition, AssignedValue, CombinationOptionCommon, MainGateInstructions,
     RangeInstructions, RegionCtx, Term,
 };
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     IntegerChip<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     pub(super) fn div_generic(
@@ -40,7 +40,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
         // self + w * quotient = b * result
 
         let main_gate = self.main_gate();
-        let (zero, one) = (N::zero(), N::one());
+        let (zero, one) = (N::ZERO, N::ONE);
 
         let negative_wrong_modulus = self.rns.negative_wrong_modulus_decomposed;
 
diff --git a/integer/src/chip/invert.rs b/integer/src/chip/invert.rs
index 280daa62..b391129e 100644
--- a/integer/src/chip/invert.rs
+++ b/integer/src/chip/invert.rs
@@ -1,12 +1,12 @@
 use super::{IntegerChip, IntegerInstructions, Range};
-use crate::{rns::Integer, AssignedInteger, FieldExt};
+use crate::{rns::Integer, AssignedInteger, PrimeField};
 use halo2::plonk::Error;
 use maingate::{
     halo2, AssignedCondition, CombinationOptionCommon, MainGateInstructions, RegionCtx, Term,
 };
 use std::rc::Rc;
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     IntegerChip<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     pub(super) fn invert_generic(
@@ -51,19 +51,19 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
         let cond = a_mul_inv
             .limb(0)
             .value()
-            .map(|a_mul_inv| N::one() - a_mul_inv);
+            .map(|a_mul_inv| N::ONE - a_mul_inv);
 
         let cond = main_gate
             .apply(
                 ctx,
                 [
-                    Term::Assigned(a_mul_inv.limb(0), N::one()),
-                    Term::Unassigned(cond, N::one()),
+                    Term::Assigned(a_mul_inv.limb(0), N::ONE),
+                    Term::Unassigned(cond, N::ONE),
                     Term::Zero,
                     Term::Zero,
                     Term::Zero,
                 ],
-                -N::one(),
+                -N::ONE,
                 CombinationOptionCommon::OneLinerMul.into(),
             )?
             .swap_remove(1);
diff --git a/integer/src/chip/mul.rs b/integer/src/chip/mul.rs
index 8b6d2e92..c872e5e2 100644
--- a/integer/src/chip/mul.rs
+++ b/integer/src/chip/mul.rs
@@ -1,13 +1,13 @@
 use super::{IntegerChip, IntegerInstructions, Range};
 use crate::rns::{Common, Integer, MaybeReduced};
-use crate::{AssignedInteger, FieldExt};
+use crate::{AssignedInteger, PrimeField};
 use halo2::{arithmetic::Field, plonk::Error};
 use maingate::{
     halo2, AssignedValue, CombinationOptionCommon, MainGateInstructions, RangeInstructions,
     RegionCtx, Term,
 };
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     IntegerChip<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     pub(super) fn constrain_binary_crt(
@@ -18,7 +18,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
         residues: Vec<AssignedValue<N>>,
     ) -> Result<(), Error> {
         let main_gate = self.main_gate();
-        let (zero, one) = (N::zero(), N::one());
+        let (zero, one) = (N::ZERO, N::ONE);
 
         // Constrain residues
         let lsh_one = self.rns.left_shifter(1);
@@ -72,7 +72,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
         b: &AssignedInteger<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>,
     ) -> Result<AssignedInteger<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>, Error> {
         let main_gate = self.main_gate();
-        let (zero, one) = (N::zero(), N::one());
+        let (zero, one) = (N::ZERO, N::ONE);
 
         let negative_wrong_modulus = self.rns.negative_wrong_modulus_decomposed;
 
@@ -200,7 +200,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
         b: &Integer<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>,
     ) -> Result<AssignedInteger<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>, Error> {
         let main_gate = self.main_gate();
-        let (zero, one) = (N::zero(), N::one());
+        let (zero, one) = (N::ZERO, N::ONE);
 
         let negative_wrong_modulus = self.rns.negative_wrong_modulus_decomposed;
 
@@ -274,7 +274,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
         b: &AssignedInteger<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>,
     ) -> Result<(), Error> {
         let main_gate = self.main_gate();
-        let (zero, one) = (N::zero(), N::one());
+        let (zero, one) = (N::ZERO, N::ONE);
 
         let negative_wrong_modulus = self.rns.negative_wrong_modulus_decomposed;
 
diff --git a/integer/src/chip/reduce.rs b/integer/src/chip/reduce.rs
index 2718535a..2bf39930 100644
--- a/integer/src/chip/reduce.rs
+++ b/integer/src/chip/reduce.rs
@@ -1,10 +1,10 @@
 use super::{IntegerChip, IntegerInstructions, Range};
 use crate::rns::MaybeReduced;
-use crate::{AssignedInteger, FieldExt};
+use crate::{AssignedInteger, PrimeField};
 use halo2::plonk::Error;
 use maingate::{halo2, AssignedValue, MainGateInstructions, RangeInstructions, RegionCtx, Term};
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     IntegerChip<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     /// Reduces an [`AssignedInteger`] if any of its limbs values is greater
@@ -79,7 +79,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
         a: &AssignedInteger<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>,
     ) -> Result<AssignedInteger<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>, Error> {
         let main_gate = self.main_gate();
-        let (zero, one) = (N::zero(), N::one());
+        let (zero, one) = (N::ZERO, N::ONE);
 
         let witness: MaybeReduced<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB> =
             a.integer().as_ref().map(|a_int| a_int.reduce()).into();
diff --git a/integer/src/chip/square.rs b/integer/src/chip/square.rs
index 73d6a7a4..9a6f2c57 100644
--- a/integer/src/chip/square.rs
+++ b/integer/src/chip/square.rs
@@ -1,12 +1,12 @@
 use super::{IntegerChip, IntegerInstructions, Range};
-use crate::{rns::MaybeReduced, AssignedInteger, FieldExt};
+use crate::{rns::MaybeReduced, AssignedInteger, PrimeField};
 use halo2::{arithmetic::Field, plonk::Error};
 use maingate::{
     halo2, AssignedValue, CombinationOptionCommon, MainGateInstructions, RangeInstructions,
     RegionCtx, Term,
 };
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     IntegerChip<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     #[allow(clippy::needless_range_loop)]
@@ -16,7 +16,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
         a: &AssignedInteger<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>,
     ) -> Result<AssignedInteger<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>, Error> {
         let main_gate = self.main_gate();
-        let (zero, one) = (N::zero(), N::one());
+        let (zero, one) = (N::ZERO, N::ONE);
 
         let negative_wrong_modulus = self.rns.negative_wrong_modulus_decomposed;
 
diff --git a/integer/src/instructions.rs b/integer/src/instructions.rs
index f50cb951..910a4a5f 100644
--- a/integer/src/instructions.rs
+++ b/integer/src/instructions.rs
@@ -1,8 +1,8 @@
 use super::{AssignedInteger, UnassignedInteger};
 use crate::maingate::{halo2, AssignedCondition, RegionCtx};
 use crate::rns::Integer;
-use halo2::arithmetic::FieldExt;
 use halo2::plonk::Error;
+use maingate::halo2::ff::PrimeField;
 
 /// Signals the range mode that should be applied while assigning a new
 /// [`Integer`]
@@ -20,8 +20,8 @@ pub enum Range {
 
 /// Common functionality for non native integer constraints
 pub trait IntegerInstructions<
-    W: FieldExt,
-    N: FieldExt,
+    W: PrimeField,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 >
@@ -289,7 +289,7 @@ pub trait IntegerInstructions<
 
     /// Tries to apply reduction to an [`AssignedInteger`] that is not in this
     /// wrong field
-    fn reduce_external<T: FieldExt>(
+    fn reduce_external<T: PrimeField>(
         &self,
         ctx: &mut RegionCtx<'_, N>,
         a: &AssignedInteger<T, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>,
diff --git a/integer/src/lib.rs b/integer/src/lib.rs
index f5dba271..5a23ea89 100644
--- a/integer/src/lib.rs
+++ b/integer/src/lib.rs
@@ -5,7 +5,8 @@
 #![deny(missing_docs)]
 
 use crate::rns::{Common, Integer, Limb};
-use halo2::{arithmetic::FieldExt, circuit::Value};
+use halo2::circuit::Value;
+use maingate::halo2::ff::PrimeField;
 use maingate::{big_to_fe, compose, fe_to_big, AssignedValue};
 use num_bigint::BigUint as big_uint;
 use rns::Rns;
@@ -33,7 +34,7 @@ pub const NUMBER_OF_LOOKUP_LIMBS: usize = 4;
 
 /// AssignedLimb is a limb of an non native integer
 #[derive(Debug, Clone)]
-pub struct AssignedLimb<F: FieldExt> {
+pub struct AssignedLimb<F: PrimeField> {
     // Witness value
     value: AssignedValue<F>,
     // Maximum value to track overflow and reduction flow
@@ -41,32 +42,32 @@ pub struct AssignedLimb<F: FieldExt> {
 }
 
 /// `AssignedLimb` can be also represented as `AssignedValue`
-impl<F: FieldExt> From<AssignedLimb<F>> for AssignedValue<F> {
+impl<F: PrimeField> From<AssignedLimb<F>> for AssignedValue<F> {
     fn from(limb: AssignedLimb<F>) -> Self {
         limb.value
     }
 }
 
 /// `AssignedLimb` can be also represented as `AssignedValue`
-impl<F: FieldExt> From<&AssignedLimb<F>> for AssignedValue<F> {
+impl<F: PrimeField> From<&AssignedLimb<F>> for AssignedValue<F> {
     fn from(limb: &AssignedLimb<F>) -> Self {
         limb.value.clone()
     }
 }
 
-impl<F: FieldExt> AsRef<AssignedValue<F>> for AssignedLimb<F> {
+impl<F: PrimeField> AsRef<AssignedValue<F>> for AssignedLimb<F> {
     fn as_ref(&self) -> &AssignedValue<F> {
         &self.value
     }
 }
 
-impl<F: FieldExt> AssignedLimb<F> {
+impl<F: PrimeField> AssignedLimb<F> {
     fn value(&self) -> Value<F> {
         self.value.value().cloned()
     }
 }
 
-impl<F: FieldExt> AssignedLimb<F> {
+impl<F: PrimeField> AssignedLimb<F> {
     /// Given an assigned value and expected maximum value constructs new
     /// `AssignedLimb`
     fn from(value: AssignedValue<F>, max_val: big_uint) -> Self {
@@ -111,13 +112,13 @@ impl<F: FieldExt> AssignedLimb<F> {
 /// Witness integer that is about to be assigned.
 #[derive(Debug, Clone)]
 pub struct UnassignedInteger<
-    W: FieldExt,
-    N: FieldExt,
+    W: PrimeField,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 >(Value<Integer<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>>);
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     From<Value<Integer<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>>>
     for UnassignedInteger<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
@@ -129,8 +130,8 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
 ///
 #[derive(Debug, Clone)]
 pub struct AssignedInteger<
-    W: FieldExt,
-    N: FieldExt,
+    W: PrimeField,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 > {
@@ -142,7 +143,7 @@ pub struct AssignedInteger<
     rns: Rc<Rns<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>>,
 }
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     AssignedInteger<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     /// Creates a new [`AssignedInteger`].
diff --git a/integer/src/rns.rs b/integer/src/rns.rs
index 62a9b976..7df8dcf9 100644
--- a/integer/src/rns.rs
+++ b/integer/src/rns.rs
@@ -1,5 +1,6 @@
 use crate::NUMBER_OF_LOOKUP_LIMBS;
-use halo2::{arithmetic::FieldExt, circuit::Value};
+use halo2::circuit::Value;
+use maingate::halo2::ff::PrimeField;
 use maingate::{big_to_fe, compose, decompose_big, fe_to_big, halo2, modulus};
 use num_bigint::BigUint as big_uint;
 use num_integer::Integer as _;
@@ -9,7 +10,7 @@ use std::marker::PhantomData;
 use std::rc::Rc;
 
 /// Common interface for [`Limb`] and [`Integer`]
-pub trait Common<F: FieldExt> {
+pub trait Common<F: PrimeField> {
     /// Returns the represented value
     fn value(&self) -> big_uint;
 
@@ -25,7 +26,7 @@ pub trait Common<F: FieldExt> {
     }
 }
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     From<Integer<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>> for big_uint
 {
     fn from(el: Integer<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>) -> Self {
@@ -41,7 +42,7 @@ fn bool_to_big(truth: bool) -> big_uint {
     }
 }
 
-impl<F: FieldExt> From<Limb<F>> for big_uint {
+impl<F: PrimeField> From<Limb<F>> for big_uint {
     fn from(limb: Limb<F>) -> Self {
         limb.value()
     }
@@ -51,8 +52,8 @@ impl<F: FieldExt> From<Limb<F>> for big_uint {
 // multiplication gate.
 #[derive(Clone)]
 pub(crate) struct ReductionWitness<
-    W: FieldExt,
-    N: FieldExt,
+    W: PrimeField,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 > {
@@ -64,13 +65,13 @@ pub(crate) struct ReductionWitness<
 
 // Wrapper for reduction witnesses
 pub(crate) struct MaybeReduced<
-    W: FieldExt,
-    N: FieldExt,
+    W: PrimeField,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 >(Value<ReductionWitness<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>>);
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     From<Value<ReductionWitness<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>>>
     for MaybeReduced<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
@@ -79,7 +80,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
     }
 }
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     MaybeReduced<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     /// Returns the quotient value as [`Integer`].
@@ -129,8 +130,12 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
 /// Short: as an element of the native field.
 /// Long : as an [`Integer`].
 #[derive(Clone, Debug)]
-pub enum Quotient<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
-{
+pub enum Quotient<
+    W: PrimeField,
+    N: PrimeField,
+    const NUMBER_OF_LIMBS: usize,
+    const BIT_LEN_LIMB: usize,
+> {
     /// Single limb quotient
     Short(N),
     /// Integer quotient
@@ -141,8 +146,8 @@ pub enum Quotient<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const
 // comparision gate.
 #[derive(Clone)]
 pub(crate) struct ComparisionWitness<
-    W: FieldExt,
-    N: FieldExt,
+    W: PrimeField,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 > {
@@ -157,7 +162,12 @@ pub(crate) struct ComparisionWitness<
 /// Contains all the necessary values to carry out operations such as
 /// multiplication and reduction in this representation.
 #[derive(Debug, Clone)]
-pub struct Rns<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize> {
+pub struct Rns<
+    W: PrimeField,
+    N: PrimeField,
+    const NUMBER_OF_LIMBS: usize,
+    const BIT_LEN_LIMB: usize,
+> {
     /// Bit lenght of sublimbs that is subject to to lookup check
     pub bit_len_lookup: usize,
 
@@ -217,7 +227,7 @@ pub struct Rns<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT
     _marker_wrong: PhantomData<W>,
 }
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     Rns<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     /// Calculates [`Rns`] `base_aux`.
@@ -620,33 +630,33 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
 
 /// Limb of an [`Integer`].
 #[derive(Debug, Clone)]
-pub struct Limb<F: FieldExt>(F);
+pub struct Limb<F: PrimeField>(F);
 
-impl<F: FieldExt> Common<F> for Limb<F> {
+impl<F: PrimeField> Common<F> for Limb<F> {
     fn value(&self) -> big_uint {
         fe_to_big(self.0)
     }
 }
 
-impl<F: FieldExt> Default for Limb<F> {
+impl<F: PrimeField> Default for Limb<F> {
     fn default() -> Self {
-        Limb(F::zero())
+        Limb(F::ZERO)
     }
 }
 
-impl<F: FieldExt> From<big_uint> for Limb<F> {
+impl<F: PrimeField> From<big_uint> for Limb<F> {
     fn from(e: big_uint) -> Self {
         Self(big_to_fe(e))
     }
 }
 
-impl<F: FieldExt> From<&str> for Limb<F> {
+impl<F: PrimeField> From<&str> for Limb<F> {
     fn from(e: &str) -> Self {
         Self(big_to_fe(big_uint::from_str_radix(e, 16).unwrap()))
     }
 }
 
-impl<F: FieldExt> Limb<F> {
+impl<F: PrimeField> Limb<F> {
     pub(crate) fn new(value: F) -> Self {
         Limb(value)
     }
@@ -662,8 +672,8 @@ impl<F: FieldExt> Limb<F> {
 /// native field plus a reference to the [`Rns`] used.
 #[derive(Clone)]
 pub struct Integer<
-    W: FieldExt,
-    N: FieldExt,
+    W: PrimeField,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 > {
@@ -671,8 +681,8 @@ pub struct Integer<
     rns: Rc<Rns<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>>,
 }
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize> fmt::Debug
-    for Integer<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+    fmt::Debug for Integer<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let value = self.value();
@@ -687,8 +697,8 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
     }
 }
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize> Common<N>
-    for Integer<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+    Common<N> for Integer<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     fn value(&self) -> big_uint {
         let limb_values = self.limbs.iter().map(|limb| limb.value()).collect();
@@ -696,7 +706,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
     }
 }
 
-impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
+impl<W: PrimeField, N: PrimeField, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB: usize>
     Integer<W, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB>
 {
     /// Creates a new integer from a vector of limbs and reference to the used
@@ -783,7 +793,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
         let result = Self::from_big(result, Rc::clone(&self.rns));
 
         let l = NUMBER_OF_LIMBS;
-        let mut t: Vec<N> = vec![N::zero(); l];
+        let mut t: Vec<N> = vec![N::ZERO; l];
         for k in 0..l {
             for i in 0..=k {
                 let j = k - i;
@@ -825,7 +835,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
         let result = Self::from_big(result.clone(), Rc::clone(&self.rns));
 
         let l = NUMBER_OF_LIMBS;
-        let mut intermediate: Vec<N> = vec![N::zero(); l];
+        let mut intermediate: Vec<N> = vec![N::ZERO; l];
         for k in 0..l {
             for i in 0..=k {
                 let j = k - i;
@@ -881,7 +891,7 @@ impl<W: FieldExt, N: FieldExt, const NUMBER_OF_LIMBS: usize, const BIT_LEN_LIMB:
         let lsh1 = self.rns.left_shifter(1);
         let (rsh1, rsh2) = (self.rns.right_shifter(1), self.rns.right_shifter(2));
 
-        let mut carry = N::zero();
+        let mut carry = N::ZERO;
         // TODO: use chunks
         (0..u_len)
             .map(|i| {
diff --git a/maingate/Cargo.toml b/maingate/Cargo.toml
index 45e1a16e..1f4d5b01 100644
--- a/maingate/Cargo.toml
+++ b/maingate/Cargo.toml
@@ -9,7 +9,6 @@ num-bigint = { version = "0.4", features = ["rand"] }
 num-integer = "0.1"
 num-traits = "0.2"
 rand = "0.8"
-group = "0.12"
 subtle = { version = "2.3", default-features = false }
 halo2wrong = { path = "../halo2wrong", default-features = false }
 
diff --git a/maingate/src/instructions.rs b/maingate/src/instructions.rs
index 6ba42bce..610cec43 100644
--- a/maingate/src/instructions.rs
+++ b/maingate/src/instructions.rs
@@ -4,13 +4,14 @@
 
 use crate::{
     halo2::{
-        arithmetic::{Field, FieldExt},
+        arithmetic::Field,
         circuit::{Chip, Layouter, Value},
         plonk::Error,
     },
     AssignedCondition, AssignedValue, ColumnTags, MainGateColumn,
 };
 use halo2wrong::{
+    halo2::ff::PrimeField,
     utils::{big_to_fe, decompose, fe_to_big, power_of_two},
     RegionCtx,
 };
@@ -27,7 +28,7 @@ use std::iter;
 /// `... + assigned_or_unassigned_witness_0 * fixed_0 +
 /// assigned_or_unassigned_witness_1 * fixed_1 + ... `
 #[derive(Clone)]
-pub enum Term<'a, F: FieldExt> {
+pub enum Term<'a, F: PrimeField> {
     /// Assigned value and fixed scalar
     Assigned(&'a AssignedValue<F>, F),
     /// Unassigned witness and fixed scalar
@@ -36,13 +37,13 @@ pub enum Term<'a, F: FieldExt> {
     Zero,
 }
 
-impl<'a, F: FieldExt> Term<'a, F> {
+impl<'a, F: PrimeField> Term<'a, F> {
     pub(crate) const fn is_zero(&self) -> bool {
         matches!(self, Term::Zero)
     }
 }
 
-impl<'a, F: FieldExt> std::fmt::Debug for Term<'a, F> {
+impl<'a, F: PrimeField> std::fmt::Debug for Term<'a, F> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
             Self::Assigned(coeff, base) => f
@@ -61,37 +62,37 @@ impl<'a, F: FieldExt> std::fmt::Debug for Term<'a, F> {
     }
 }
 
-impl<'a, F: FieldExt> Term<'a, F> {
+impl<'a, F: PrimeField> Term<'a, F> {
     /// Wrap an assigned value that is about to be multiplied by other term
     pub fn assigned_to_mul(e: &'a AssignedValue<F>) -> Self {
-        Term::Assigned(e, F::zero())
+        Term::Assigned(e, F::ZERO)
     }
 
     /// Wrap an assigned value that is about to be added to the other terms
     pub fn assigned_to_add(e: &'a AssignedValue<F>) -> Self {
-        Term::Assigned(e, F::one())
+        Term::Assigned(e, F::ONE)
     }
 
     /// Wrap an assigned value that is about to be subtracted from the other
     /// terms
     pub fn assigned_to_sub(e: &'a AssignedValue<F>) -> Self {
-        Term::Assigned(e, -F::one())
+        Term::Assigned(e, -F::ONE)
     }
 
     /// Wrap an unassigned value that is about to be multiplied by other term
     pub fn unassigned_to_mul(e: Value<F>) -> Self {
-        Term::Unassigned(e, F::zero())
+        Term::Unassigned(e, F::ZERO)
     }
 
     /// Wrap an unassigned value that is about to be added to the other terms
     pub fn unassigned_to_add(e: Value<F>) -> Self {
-        Term::Unassigned(e, F::one())
+        Term::Unassigned(e, F::ONE)
     }
 
     /// Wrap an unassigned value that is about to be subtracted from the other
     /// terms
     pub fn unassigned_to_sub(e: Value<F>) -> Self {
-        Term::Unassigned(e, -F::one())
+        Term::Unassigned(e, -F::ONE)
     }
 
     /// Retuns the witness part of this term
@@ -99,7 +100,7 @@ impl<'a, F: FieldExt> Term<'a, F> {
         match self {
             Self::Assigned(assigned, _) => assigned.value().copied(),
             Self::Unassigned(unassigned, _) => *unassigned,
-            Self::Zero => Value::known(F::zero()),
+            Self::Zero => Value::known(F::ZERO),
         }
     }
 
@@ -108,7 +109,7 @@ impl<'a, F: FieldExt> Term<'a, F> {
         match self {
             Self::Assigned(_, base) => *base,
             Self::Unassigned(_, base) => *base,
-            Self::Zero => F::zero(),
+            Self::Zero => F::ZERO,
         }
     }
 
@@ -128,7 +129,7 @@ impl<'a, F: FieldExt> Term<'a, F> {
 /// when it has one multiplication gate one addition gate and one further
 /// rotation gate.
 #[derive(Clone, Debug)]
-pub enum CombinationOptionCommon<F: FieldExt> {
+pub enum CombinationOptionCommon<F: PrimeField> {
     /// Opens only single multiplication gate
     OneLinerMul,
     /// All multiplications gates are closed
@@ -148,7 +149,7 @@ pub enum CombinationOptionCommon<F: FieldExt> {
 /// Instructions covers many basic constaints such as assignments, logical and
 /// arithmetic operations. Also includes general purpose `combine` and  `apply`
 /// functions to let user to build custom constaints using this main gate
-pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
+pub trait MainGateInstructions<F: PrimeField, const WIDTH: usize>: Chip<F> {
     /// Options for implementors to implement some more custom functionalities
     type CombinationOption: From<CombinationOptionCommon<F>>;
     /// Position related customisations should be defined as ['MainGateColumn']
@@ -221,7 +222,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
                 Term::unassigned_to_mul(bit),
                 Term::unassigned_to_sub(bit),
             ],
-            F::zero(),
+            F::ZERO,
             CombinationOptionCommon::OneLinerMul.into(),
         )?;
 
@@ -245,7 +246,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
                 Term::assigned_to_mul(bit),
                 Term::assigned_to_sub(bit),
             ],
-            F::zero(),
+            F::ZERO,
             CombinationOptionCommon::OneLinerMul.into(),
         )?;
 
@@ -266,7 +267,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
         self.apply(
             ctx,
             [Term::assigned_to_sub(a), Term::assigned_to_sub(b)],
-            F::one(),
+            F::ONE,
             CombinationOptionCommon::OneLinerMul.into(),
         )?;
 
@@ -296,7 +297,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
                     Term::assigned_to_sub(c2),
                     Term::unassigned_to_add(c),
                 ],
-                F::zero(),
+                F::ZERO,
                 CombinationOptionCommon::OneLinerMul.into(),
             )?
             .swap_remove(2);
@@ -323,7 +324,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
                     Term::assigned_to_mul(c2),
                     Term::unassigned_to_sub(c),
                 ],
-                F::zero(),
+                F::ZERO,
                 CombinationOptionCommon::OneLinerMul.into(),
             )?
             .swap_remove(2))
@@ -336,13 +337,13 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
         c: &AssignedCondition<F>,
     ) -> Result<AssignedCondition<F>, Error> {
         // Find the new witness
-        let not_c = c.value().map(|c| F::one() - c);
+        let not_c = c.value().map(|c| F::ONE - c);
 
         Ok(self
             .apply(
                 ctx,
                 [Term::assigned_to_add(c), Term::unassigned_to_add(not_c)],
-                -F::one(),
+                -F::ONE,
                 CombinationOptionCommon::OneLinerAdd.into(),
             )?
             .swap_remove(1))
@@ -361,7 +362,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
             // Non inversion case will never be verified
             Option::<F>::from(b.invert())
                 .map(|b_inverted| *a * b_inverted)
-                .unwrap_or_else(F::zero)
+                .unwrap_or(F::ZERO)
         });
 
         Ok(self
@@ -372,7 +373,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
                     Term::unassigned_to_mul(c),
                     Term::assigned_to_add(a),
                 ],
-                F::zero(),
+                F::ZERO,
                 CombinationOptionCommon::OneLinerMul.into(),
             )?
             .swap_remove(1))
@@ -401,14 +402,14 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
     ) -> Result<AssignedValue<F>, Error> {
         let inverse = a.value().map(|a| {
             // Non inversion case will never be verified.
-            a.invert().unwrap_or_else(F::zero)
+            a.invert().unwrap_or(F::ZERO)
         });
 
         Ok(self
             .apply(
                 ctx,
                 [Term::assigned_to_mul(a), Term::unassigned_to_mul(inverse)],
-                -F::one(),
+                -F::ONE,
                 CombinationOptionCommon::OneLinerMul.into(),
             )?
             .swap_remove(1))
@@ -421,7 +422,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
         ctx: &mut RegionCtx<'_, F>,
         a: &AssignedValue<F>,
     ) -> Result<(AssignedValue<F>, AssignedCondition<F>), Error> {
-        let (one, zero) = (F::one(), F::zero());
+        let (one, zero) = (F::ONE, F::ZERO);
 
         // Returns 'r' as a condition bit that defines if inversion successful or not
         // First enfoce 'r' to be a bit
@@ -511,7 +512,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
         self.apply(
             ctx,
             [Term::assigned_to_add(a), Term::assigned_to_sub(b)],
-            F::zero(),
+            F::ZERO,
             CombinationOptionCommon::OneLinerAdd.into(),
         )?;
 
@@ -526,7 +527,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
         b: &AssignedValue<F>,
     ) -> Result<(), Error> {
         // (a - b) must have an inverse
-        let c = self.sub_with_constant(ctx, a, b, F::zero())?;
+        let c = self.sub_with_constant(ctx, a, b, F::ZERO)?;
         self.assert_not_zero(ctx, &c)
     }
 
@@ -537,7 +538,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
         a: &AssignedValue<F>,
         b: &AssignedValue<F>,
     ) -> Result<AssignedCondition<F>, Error> {
-        let (one, zero) = (F::one(), F::zero());
+        let (one, zero) = (F::ONE, F::ZERO);
 
         // Given a and b equation below is enforced
         // 0 = (a - b) * (r * (1 - x) + x) + r - 1
@@ -605,7 +606,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
 
     /// Enforces that assigned value is zero % w
     fn assert_zero(&self, ctx: &mut RegionCtx<'_, F>, a: &AssignedValue<F>) -> Result<(), Error> {
-        self.assert_equal_to_constant(ctx, a, F::zero())
+        self.assert_equal_to_constant(ctx, a, F::ZERO)
     }
 
     /// Enforces that assigned value is not zero.
@@ -619,13 +620,13 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
 
         let w = a.value().map(|a| {
             // Non inversion case will never be verified.
-            a.invert().unwrap_or_else(F::zero)
+            a.invert().unwrap_or(F::ZERO)
         });
 
         self.apply(
             ctx,
             [Term::assigned_to_mul(a), Term::unassigned_to_mul(w)],
-            -F::one(),
+            -F::ONE,
             CombinationOptionCommon::OneLinerMul.into(),
         )?;
 
@@ -646,7 +647,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
     /// Assigns new bit flag `1` if given value eqauls to `1` otherwise assigns
     /// `0`
     fn assert_one(&self, ctx: &mut RegionCtx<'_, F>, a: &AssignedValue<F>) -> Result<(), Error> {
-        self.assert_equal_to_constant(ctx, a, F::one())
+        self.assert_equal_to_constant(ctx, a, F::ONE)
     }
 
     /// Assigns a new witness `r` as:
@@ -676,7 +677,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
         a: &AssignedValue<F>,
         b: &AssignedValue<F>,
     ) -> Result<AssignedValue<F>, Error> {
-        self.sub_with_constant(ctx, a, b, F::zero())
+        self.sub_with_constant(ctx, a, b, F::ZERO)
     }
 
     /// Assigns a new witness `r` as:
@@ -740,7 +741,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
                     Term::assigned_to_add(a),
                     Term::unassigned_to_sub(c),
                 ],
-                F::zero(),
+                F::ZERO,
                 CombinationOptionCommon::OneLinerAdd.into(),
             )?
             .swap_remove(2))
@@ -763,7 +764,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
                     Term::assigned_to_add(a),
                     Term::unassigned_to_sub(c),
                 ],
-                F::zero(),
+                F::ZERO,
                 CombinationOptionCommon::OneLinerAdd.into(),
             )?
             .swap_remove(3))
@@ -787,7 +788,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
                     Term::assigned_to_mul(b),
                     Term::unassigned_to_sub(c),
                 ],
-                F::zero(),
+                F::ZERO,
                 CombinationOptionCommon::OneLinerMul.into(),
             )?
             .swap_remove(2))
@@ -817,7 +818,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
                     Term::assigned_to_add(to_add),
                     Term::unassigned_to_sub(c),
                 ],
-                F::zero(),
+                F::ZERO,
                 CombinationOptionCommon::OneLinerMul.into(),
             )?
             .swap_remove(3))
@@ -859,7 +860,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
         self.apply(
             ctx,
             [Term::assigned_to_mul(a), Term::assigned_to_mul(b)],
-            F::zero(),
+            F::ZERO,
             CombinationOptionCommon::OneLinerMul.into(),
         )?;
         Ok(())
@@ -873,7 +874,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
         a: &AssignedValue<F>,
         b: &AssignedValue<F>,
     ) -> Result<AssignedValue<F>, Error> {
-        self.add_with_constant(ctx, a, b, F::zero())
+        self.add_with_constant(ctx, a, b, F::ZERO)
     }
 
     /// Assigns a new witness `r` as:
@@ -954,10 +955,10 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
             ctx,
             [
                 Term::Unassigned(w.map(|w| w.1), F::from(2)),
-                Term::Assigned(&sign, F::one()),
-                Term::Assigned(a, -F::one()),
+                Term::Assigned(&sign, F::ONE),
+                Term::Assigned(a, -F::ONE),
             ],
-            F::zero(),
+            F::ZERO,
             CombinationOptionCommon::OneLinerAdd.into(),
         )?;
 
@@ -994,7 +995,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
             .zip(bases.into_iter())
             .map(|(bit, base)| Term::Assigned(bit, base))
             .collect::<Vec<_>>();
-        let result = self.compose(ctx, &terms, F::zero())?;
+        let result = self.compose(ctx, &terms, F::ZERO)?;
         self.assert_equal(ctx, &result, composed)?;
         Ok(bits)
     }
@@ -1027,8 +1028,8 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
 
         let mut assigned: Vec<AssignedValue<F>> = vec![];
         for (i, chunk) in terms.chunks(chunk_width).enumerate() {
-            let intermediate = Term::Unassigned(remaining, -F::one());
-            let constant = if i == 0 { constant } else { F::zero() };
+            let intermediate = Term::Unassigned(remaining, -F::ONE);
+            let constant = if i == 0 { constant } else { F::ZERO };
             let mut chunk = chunk.to_vec();
 
             let composed = Term::compose(&chunk[..], constant);
@@ -1050,7 +1051,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
                 CombinationOptionCommon::OneLinerAdd
             // Intermediate round should accumulate the sum
             } else {
-                CombinationOptionCommon::CombineToNextAdd(F::one())
+                CombinationOptionCommon::CombineToNextAdd(F::ONE)
             };
 
             enable_lookup(ctx, is_final)?;
@@ -1122,7 +1123,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
             if one_liner {
                 CombinationOptionCommon::OneLinerAdd
             } else {
-                CombinationOptionCommon::CombineToNextAdd(-F::one())
+                CombinationOptionCommon::CombineToNextAdd(-F::ONE)
             }
             .into(),
         )?;
@@ -1141,24 +1142,24 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
                         .iter()
                         .cloned()
                         .chain(iter::repeat(Term::Zero).take(WIDTH - chunk.len() - 1))
-                        .chain(iter::once(Term::Unassigned(intermediate_sum, F::one()))),
-                    F::zero(),
+                        .chain(iter::once(Term::Unassigned(intermediate_sum, F::ONE))),
+                    F::ZERO,
                     if i == number_of_chunks - 1 {
                         CombinationOptionCommon::OneLinerAdd
                     } else {
-                        CombinationOptionCommon::CombineToNextAdd(-F::one())
+                        CombinationOptionCommon::CombineToNextAdd(-F::ONE)
                     }
                     .into(),
                 )?;
 
                 intermediate_sum = intermediate_sum
-                    .zip(Term::compose(chunk, F::zero()))
+                    .zip(Term::compose(chunk, F::ZERO))
                     .map(|(cur, result)| cur + result);
 
                 // // Sanity check for prover
                 // if i == number_of_chunks - 1 {
                 //     if let Some(value) = intermediate_sum {
-                //         assert_eq!(value, F::zero())
+                //         assert_eq!(value, F::ZERO)
                 //     };
                 // }
             }
@@ -1182,12 +1183,7 @@ pub trait MainGateInstructions<F: FieldExt, const WIDTH: usize>: Chip<F> {
     /// Intentionally introduce not to be satisfied witnesses. Use only for
     /// debug purposes.
     fn break_here(&self, ctx: &mut RegionCtx<'_, F>) -> Result<(), Error> {
-        self.apply(
-            ctx,
-            [],
-            F::one(),
-            CombinationOptionCommon::OneLinerAdd.into(),
-        )?;
+        self.apply(ctx, [], F::ONE, CombinationOptionCommon::OneLinerAdd.into())?;
         Ok(())
     }
 }
diff --git a/maingate/src/main_gate.rs b/maingate/src/main_gate.rs
index 2416e910..738e263c 100644
--- a/maingate/src/main_gate.rs
+++ b/maingate/src/main_gate.rs
@@ -8,13 +8,13 @@
 //! public_input +
 //! q_constant = 0
 
-use crate::halo2::arithmetic::FieldExt;
 use crate::halo2::circuit::{Chip, Layouter};
 use crate::halo2::plonk::{Advice, Column, ConstraintSystem, Error, Fixed, Instance};
 use crate::halo2::poly::Rotation;
 use crate::instructions::{CombinationOptionCommon, MainGateInstructions, Term};
 use crate::{AssignedCondition, AssignedValue};
 use halo2wrong::halo2::circuit::Value;
+use halo2wrong::halo2::ff::PrimeField;
 use halo2wrong::RegionCtx;
 use std::{iter, marker::PhantomData};
 
@@ -93,12 +93,12 @@ impl MainGateConfig {
 
 /// MainGate implements instructions with [`MainGateConfig`]
 #[derive(Clone, Debug)]
-pub struct MainGate<F: FieldExt> {
+pub struct MainGate<F: PrimeField> {
     config: MainGateConfig,
     _marker: PhantomData<F>,
 }
 
-impl<F: FieldExt> Chip<F> for MainGate<F> {
+impl<F: PrimeField> Chip<F> for MainGate<F> {
     type Config = MainGateConfig;
     type Loaded = ();
 
@@ -113,7 +113,7 @@ impl<F: FieldExt> Chip<F> for MainGate<F> {
 
 /// Additional combination customisations for this gate with two multiplication
 #[derive(Clone, Debug)]
-pub enum CombinationOption<F: FieldExt> {
+pub enum CombinationOption<F: PrimeField> {
     /// Wrapper for common combination options
     Common(CombinationOptionCommon<F>),
     /// Activates both of the multiplication gate
@@ -123,13 +123,13 @@ pub enum CombinationOption<F: FieldExt> {
     CombineToNextDoubleMul(F),
 }
 
-impl<F: FieldExt> From<CombinationOptionCommon<F>> for CombinationOption<F> {
+impl<F: PrimeField> From<CombinationOptionCommon<F>> for CombinationOption<F> {
     fn from(option: CombinationOptionCommon<F>) -> Self {
         CombinationOption::Common(option)
     }
 }
 
-impl<F: FieldExt> MainGateInstructions<F, WIDTH> for MainGate<F> {
+impl<F: PrimeField> MainGateInstructions<F, WIDTH> for MainGate<F> {
     type CombinationOption = CombinationOption<F>;
     type MainGateColumn = MainGateColumn;
 
@@ -212,10 +212,10 @@ impl<F: FieldExt> MainGateInstructions<F, WIDTH> for MainGate<F> {
             .zip(b.value())
             .zip(cond.value())
             .map(|((a, b), cond)| {
-                if *cond == F::one() {
+                if *cond == F::ONE {
                     *a
                 } else {
-                    assert_eq!(*cond, F::zero());
+                    assert_eq!(*cond, F::ZERO);
                     *b
                 }
             });
@@ -229,8 +229,8 @@ impl<F: FieldExt> MainGateInstructions<F, WIDTH> for MainGate<F> {
                 Term::assigned_to_add(b),
                 Term::unassigned_to_sub(res),
             ],
-            F::zero(),
-            CombinationOption::OneLinerDoubleMul(-F::one()),
+            F::ZERO,
+            CombinationOption::OneLinerDoubleMul(-F::ONE),
         )?;
         ctx.constrain_equal(assigned[0].cell(), assigned[2].cell())?;
         Ok(assigned.swap_remove(4))
@@ -258,10 +258,10 @@ impl<F: FieldExt> MainGateInstructions<F, WIDTH> for MainGate<F> {
             .map(|(a, cond)| {
                 (
                     *a - b,
-                    if *cond == F::one() {
+                    if *cond == F::ONE {
                         *a
                     } else {
-                        assert_eq!(*cond, F::zero());
+                        assert_eq!(*cond, F::ZERO);
                         b
                     },
                 )
@@ -337,8 +337,8 @@ impl<F: FieldExt> MainGateInstructions<F, WIDTH> for MainGate<F> {
                 // q_e_next * e +
                 // q_constant = 0
                 CombinationOptionCommon::CombineToNextMul(next) => {
-                    ctx.assign_fixed(|| "s_mul_ab", self.config.s_mul_ab, F::one())?;
-                    ctx.assign_fixed(|| "s_mul_cd", self.config.s_mul_cd, F::zero())?;
+                    ctx.assign_fixed(|| "s_mul_ab", self.config.s_mul_ab, F::ONE)?;
+                    ctx.assign_fixed(|| "s_mul_cd", self.config.s_mul_cd, F::ZERO)?;
                     ctx.assign_fixed(|| "se_next", self.config.se_next, next)?;
                 }
 
@@ -348,7 +348,7 @@ impl<F: FieldExt> MainGateInstructions<F, WIDTH> for MainGate<F> {
                 // q_constant = 0
                 CombinationOptionCommon::CombineToNextScaleMul(next, n) => {
                     ctx.assign_fixed(|| "s_mul_ab", self.config.s_mul_ab, n)?;
-                    ctx.assign_fixed(|| "s_mul_cd", self.config.s_mul_cd, F::zero())?;
+                    ctx.assign_fixed(|| "s_mul_cd", self.config.s_mul_cd, F::ZERO)?;
                     ctx.assign_fixed(|| "se_next", self.config.se_next, next)?;
                 }
 
@@ -356,8 +356,8 @@ impl<F: FieldExt> MainGateInstructions<F, WIDTH> for MainGate<F> {
                 // q_e_next * e +
                 // q_constant = 0
                 CombinationOptionCommon::CombineToNextAdd(next) => {
-                    ctx.assign_fixed(|| "s_mul_ab", self.config.s_mul_ab, F::zero())?;
-                    ctx.assign_fixed(|| "s_mul_cd", self.config.s_mul_cd, F::zero())?;
+                    ctx.assign_fixed(|| "s_mul_ab", self.config.s_mul_ab, F::ZERO)?;
+                    ctx.assign_fixed(|| "s_mul_cd", self.config.s_mul_cd, F::ZERO)?;
                     ctx.assign_fixed(|| "se_next", self.config.se_next, next)?;
                 }
 
@@ -365,17 +365,17 @@ impl<F: FieldExt> MainGateInstructions<F, WIDTH> for MainGate<F> {
                 // q_mul_ab * a * b +
                 // q_constant = 0
                 CombinationOptionCommon::OneLinerMul => {
-                    ctx.assign_fixed(|| "s_mul_ab", self.config.s_mul_ab, F::one())?;
-                    ctx.assign_fixed(|| "s_mul_cd", self.config.s_mul_cd, F::zero())?;
-                    ctx.assign_fixed(|| "se_next", self.config.se_next, F::zero())?;
+                    ctx.assign_fixed(|| "s_mul_ab", self.config.s_mul_ab, F::ONE)?;
+                    ctx.assign_fixed(|| "s_mul_cd", self.config.s_mul_cd, F::ZERO)?;
+                    ctx.assign_fixed(|| "se_next", self.config.se_next, F::ZERO)?;
                 }
 
                 // q_a * a + q_b * b + q_c * c + q_d * d + q_e * e +
                 // q_constant = 0
                 CombinationOptionCommon::OneLinerAdd => {
-                    ctx.assign_fixed(|| "se_next", self.config.se_next, F::zero())?;
-                    ctx.assign_fixed(|| "s_mul_ab", self.config.s_mul_ab, F::zero())?;
-                    ctx.assign_fixed(|| "s_mul_cd", self.config.s_mul_cd, F::zero())?;
+                    ctx.assign_fixed(|| "se_next", self.config.se_next, F::ZERO)?;
+                    ctx.assign_fixed(|| "s_mul_ab", self.config.s_mul_ab, F::ZERO)?;
+                    ctx.assign_fixed(|| "s_mul_cd", self.config.s_mul_cd, F::ZERO)?;
                 }
             },
 
@@ -385,8 +385,8 @@ impl<F: FieldExt> MainGateInstructions<F, WIDTH> for MainGate<F> {
             // q_e_next * e +
             // q_constant = 0
             CombinationOption::CombineToNextDoubleMul(next) => {
-                ctx.assign_fixed(|| "s_mul_ab", self.config.s_mul_ab, F::one())?;
-                ctx.assign_fixed(|| "s_mul_cd", self.config.s_mul_cd, F::one())?;
+                ctx.assign_fixed(|| "s_mul_ab", self.config.s_mul_ab, F::ONE)?;
+                ctx.assign_fixed(|| "s_mul_cd", self.config.s_mul_cd, F::ONE)?;
                 ctx.assign_fixed(|| "se_next", self.config.se_next, next)?;
             }
 
@@ -395,9 +395,9 @@ impl<F: FieldExt> MainGateInstructions<F, WIDTH> for MainGate<F> {
             // q_mul_cd * c * d +
             // q_constant = 0
             CombinationOption::OneLinerDoubleMul(e) => {
-                ctx.assign_fixed(|| "s_mul_ab", self.config.s_mul_ab, F::one())?;
+                ctx.assign_fixed(|| "s_mul_ab", self.config.s_mul_ab, F::ONE)?;
                 ctx.assign_fixed(|| "s_mul_cd", self.config.s_mul_cd, e)?;
-                ctx.assign_fixed(|| "se_next", self.config.se_next, F::zero())?;
+                ctx.assign_fixed(|| "se_next", self.config.se_next, F::ZERO)?;
             }
         };
 
@@ -415,21 +415,21 @@ impl<F: FieldExt> MainGateInstructions<F, WIDTH> for MainGate<F> {
 
     /// Skip this row without any operation
     fn no_operation(&self, ctx: &mut RegionCtx<'_, F>) -> Result<(), Error> {
-        ctx.assign_fixed(|| "s_mul_ab", self.config.s_mul_ab, F::zero())?;
-        ctx.assign_fixed(|| "s_mul_cd", self.config.s_mul_cd, F::zero())?;
-        ctx.assign_fixed(|| "sc", self.config.sc, F::zero())?;
-        ctx.assign_fixed(|| "sa", self.config.sa, F::zero())?;
-        ctx.assign_fixed(|| "sb", self.config.sb, F::zero())?;
-        ctx.assign_fixed(|| "sd", self.config.sd, F::zero())?;
-        ctx.assign_fixed(|| "se", self.config.se, F::zero())?;
-        ctx.assign_fixed(|| "se_next", self.config.se_next, F::zero())?;
-        ctx.assign_fixed(|| "s_constant", self.config.s_constant, F::zero())?;
+        ctx.assign_fixed(|| "s_mul_ab", self.config.s_mul_ab, F::ZERO)?;
+        ctx.assign_fixed(|| "s_mul_cd", self.config.s_mul_cd, F::ZERO)?;
+        ctx.assign_fixed(|| "sc", self.config.sc, F::ZERO)?;
+        ctx.assign_fixed(|| "sa", self.config.sa, F::ZERO)?;
+        ctx.assign_fixed(|| "sb", self.config.sb, F::ZERO)?;
+        ctx.assign_fixed(|| "sd", self.config.sd, F::ZERO)?;
+        ctx.assign_fixed(|| "se", self.config.se, F::ZERO)?;
+        ctx.assign_fixed(|| "se_next", self.config.se_next, F::ZERO)?;
+        ctx.assign_fixed(|| "s_constant", self.config.s_constant, F::ZERO)?;
         ctx.next();
         Ok(())
     }
 }
 
-impl<F: FieldExt> MainGate<F> {
+impl<F: PrimeField> MainGate<F> {
     /// Create new main gate with given config
     pub fn new(config: MainGateConfig) -> Self {
         MainGate {
@@ -526,13 +526,12 @@ mod tests {
 
     use super::{MainGate, MainGateConfig, Term};
     use crate::curves::pasta::Fp;
-    use crate::halo2::arithmetic::FieldExt;
     use crate::halo2::circuit::{Layouter, SimpleFloorPlanner, Value};
     use crate::halo2::dev::MockProver;
     use crate::halo2::plonk::{Circuit, ConstraintSystem, Error};
     use crate::main_gate::{CombinationOptionCommon, MainGateInstructions};
     use crate::AssignedCondition;
-    use group::ff::PrimeField;
+    use halo2wrong::halo2::ff::PrimeField;
     use halo2wrong::utils::{big_to_fe, decompose};
     use halo2wrong::RegionCtx;
     use rand_core::OsRng;
@@ -544,7 +543,7 @@ mod tests {
     }
 
     impl TestCircuitConfig {
-        fn main_gate<F: FieldExt>(&self) -> MainGate<F> {
+        fn main_gate<F: PrimeField>(&self) -> MainGate<F> {
             MainGate::<F> {
                 config: self.main_gate_config.clone(),
                 _marker: PhantomData,
@@ -553,12 +552,12 @@ mod tests {
     }
 
     #[derive(Default)]
-    struct TestCircuitPublicInputs<F: FieldExt> {
+    struct TestCircuitPublicInputs<F: PrimeField> {
         _marker: PhantomData<F>,
         public_input: F,
     }
 
-    impl<F: FieldExt> Circuit<F> for TestCircuitPublicInputs<F> {
+    impl<F: PrimeField> Circuit<F> for TestCircuitPublicInputs<F> {
         type Config = TestCircuitConfig;
         type FloorPlanner = SimpleFloorPlanner;
 
@@ -611,11 +610,11 @@ mod tests {
     }
 
     #[derive(Default)]
-    struct TestCircuitCombination<F: FieldExt> {
+    struct TestCircuitCombination<F: PrimeField> {
         _marker: PhantomData<F>,
     }
 
-    impl<F: FieldExt> Circuit<F> for TestCircuitCombination<F> {
+    impl<F: PrimeField> Circuit<F> for TestCircuitCombination<F> {
         type Config = TestCircuitConfig;
         type FloorPlanner = SimpleFloorPlanner;
 
@@ -886,12 +885,12 @@ mod tests {
     }
 
     #[derive(Default)]
-    struct TestCircuitBitness<F: FieldExt> {
+    struct TestCircuitBitness<F: PrimeField> {
         neg_path: bool,
         _marker: PhantomData<F>,
     }
 
-    impl<F: FieldExt> Circuit<F> for TestCircuitBitness<F> {
+    impl<F: PrimeField> Circuit<F> for TestCircuitBitness<F> {
         type Config = TestCircuitConfig;
         type FloorPlanner = SimpleFloorPlanner;
 
@@ -918,11 +917,11 @@ mod tests {
                     let ctx = &mut RegionCtx::new(region, offset);
 
                     if self.neg_path {
-                        let minus_one = -F::one();
+                        let minus_one = -F::ONE;
                         main_gate.assign_bit(ctx, Value::known(minus_one))?;
                     } else {
-                        let one = F::one();
-                        let zero = F::zero();
+                        let one = F::ONE;
+                        let zero = F::ZERO;
 
                         let u = main_gate.assign_bit(ctx, Value::known(one))?;
                         main_gate.assert_bit(ctx, &u)?;
@@ -966,12 +965,12 @@ mod tests {
     }
 
     #[derive(Default)]
-    struct TestCircuitEquality<F: FieldExt> {
+    struct TestCircuitEquality<F: PrimeField> {
         neg_path: bool,
         _marker: PhantomData<F>,
     }
 
-    impl<F: FieldExt> Circuit<F> for TestCircuitEquality<F> {
+    impl<F: PrimeField> Circuit<F> for TestCircuitEquality<F> {
         type Config = TestCircuitConfig;
         type FloorPlanner = SimpleFloorPlanner;
 
@@ -1001,8 +1000,8 @@ mod tests {
 
                     if self.neg_path {
                     } else {
-                        let one = F::one();
-                        let zero = F::zero();
+                        let one = F::ONE;
+                        let zero = F::ZERO;
 
                         let assigned_one = &main_gate.assign_bit(ctx, Value::known(one))?;
                         let assigned_zero = &main_gate.assign_bit(ctx, Value::known(zero))?;
@@ -1085,11 +1084,11 @@ mod tests {
     }
 
     #[derive(Default)]
-    struct TestCircuitArith<F: FieldExt> {
+    struct TestCircuitArith<F: PrimeField> {
         _marker: PhantomData<F>,
     }
 
-    impl<F: FieldExt> Circuit<F> for TestCircuitArith<F> {
+    impl<F: PrimeField> Circuit<F> for TestCircuitArith<F> {
         type Config = TestCircuitConfig;
         type FloorPlanner = SimpleFloorPlanner;
 
@@ -1233,11 +1232,11 @@ mod tests {
     }
 
     #[derive(Default)]
-    struct TestCircuitConditionals<F: FieldExt> {
+    struct TestCircuitConditionals<F: PrimeField> {
         _marker: PhantomData<F>,
     }
 
-    impl<F: FieldExt> Circuit<F> for TestCircuitConditionals<F> {
+    impl<F: PrimeField> Circuit<F> for TestCircuitConditionals<F> {
         type Config = TestCircuitConfig;
         type FloorPlanner = SimpleFloorPlanner;
 
@@ -1270,7 +1269,7 @@ mod tests {
 
                     let a = rand();
                     let b = rand();
-                    let cond = F::zero();
+                    let cond = F::ZERO;
 
                     let a = Value::known(a);
                     let b = Value::known(b);
@@ -1284,7 +1283,7 @@ mod tests {
 
                     let a = rand();
                     let b = rand();
-                    let cond = F::one();
+                    let cond = F::ONE;
 
                     let a = Value::known(a);
                     let b = Value::known(b);
@@ -1298,7 +1297,7 @@ mod tests {
 
                     let a = rand();
                     let b_constant = rand();
-                    let cond = F::zero();
+                    let cond = F::ZERO;
 
                     let a = Value::known(a);
                     let b_unassigned = Value::known(b_constant);
@@ -1312,7 +1311,7 @@ mod tests {
 
                     let a = rand();
                     let b_constant = rand();
-                    let cond = F::one();
+                    let cond = F::ONE;
 
                     let a = Value::known(a);
                     let cond = Value::known(cond);
@@ -1347,12 +1346,12 @@ mod tests {
     }
 
     #[derive(Default)]
-    struct TestCircuitDecomposition<F: FieldExt> {
+    struct TestCircuitDecomposition<F: PrimeField> {
         _marker: PhantomData<F>,
         number_of_bits: usize,
     }
 
-    impl<F: FieldExt> Circuit<F> for TestCircuitDecomposition<F> {
+    impl<F: PrimeField> Circuit<F> for TestCircuitDecomposition<F> {
         type Config = TestCircuitConfig;
         type FloorPlanner = SimpleFloorPlanner;
 
@@ -1391,7 +1390,7 @@ mod tests {
                     assert_eq!(decomposed.len(), a_decomposed.len());
 
                     for (assigned, value) in a_decomposed.iter().zip(decomposed.into_iter()) {
-                        if value == F::zero() {
+                        if value == F::ZERO {
                             main_gate.assert_zero(ctx, assigned)?;
                         } else {
                             main_gate.assert_one(ctx, assigned)?;
@@ -1440,11 +1439,11 @@ mod tests {
     }
 
     #[derive(Default)]
-    struct TestCircuitComposition<F: FieldExt> {
+    struct TestCircuitComposition<F: PrimeField> {
         _marker: PhantomData<F>,
     }
 
-    impl<F: FieldExt> Circuit<F> for TestCircuitComposition<F> {
+    impl<F: PrimeField> Circuit<F> for TestCircuitComposition<F> {
         type Config = TestCircuitConfig;
         type FloorPlanner = SimpleFloorPlanner;
 
@@ -1509,11 +1508,11 @@ mod tests {
     }
 
     #[derive(Default)]
-    struct TestCircuitSign<F: FieldExt> {
+    struct TestCircuitSign<F: PrimeField> {
         _marker: PhantomData<F>,
     }
 
-    impl<F: FieldExt> Circuit<F> for TestCircuitSign<F> {
+    impl<F: PrimeField> Circuit<F> for TestCircuitSign<F> {
         type Config = TestCircuitConfig;
         type FloorPlanner = SimpleFloorPlanner;
 
diff --git a/maingate/src/range.rs b/maingate/src/range.rs
index 13e16a6e..9a4d7c32 100644
--- a/maingate/src/range.rs
+++ b/maingate/src/range.rs
@@ -1,5 +1,4 @@
 use super::main_gate::{MainGate, MainGateConfig};
-use crate::halo2::arithmetic::FieldExt;
 use crate::halo2::circuit::Chip;
 use crate::halo2::circuit::Layouter;
 use crate::halo2::circuit::Value;
@@ -8,6 +7,7 @@ use crate::halo2::plonk::{Selector, TableColumn};
 use crate::halo2::poly::Rotation;
 use crate::instructions::{MainGateInstructions, Term};
 use crate::AssignedValue;
+use halo2wrong::halo2::ff::PrimeField;
 use halo2wrong::halo2::plonk::Advice;
 use halo2wrong::halo2::plonk::Column;
 use halo2wrong::halo2::plonk::Fixed;
@@ -35,19 +35,19 @@ pub struct RangeConfig {
 
 /// ['RangeChip'] applies binary range constraints
 #[derive(Clone, Debug)]
-pub struct RangeChip<F: FieldExt> {
+pub struct RangeChip<F: PrimeField> {
     config: RangeConfig,
     main_gate: MainGate<F>,
     bases: BTreeMap<usize, Vec<F>>,
 }
 
-impl<F: FieldExt> RangeChip<F> {
+impl<F: PrimeField> RangeChip<F> {
     fn main_gate(&self) -> &MainGate<F> {
         &self.main_gate
     }
 }
 
-impl<F: FieldExt> Chip<F> for RangeChip<F> {
+impl<F: PrimeField> Chip<F> for RangeChip<F> {
     type Config = RangeConfig;
     type Loaded = ();
     fn config(&self) -> &Self::Config {
@@ -59,7 +59,7 @@ impl<F: FieldExt> Chip<F> for RangeChip<F> {
 }
 
 /// Generic chip interface for bitwise ranging values
-pub trait RangeInstructions<F: FieldExt>: Chip<F> {
+pub trait RangeInstructions<F: PrimeField>: Chip<F> {
     /// Assigns new witness
     fn assign(
         &self,
@@ -82,7 +82,7 @@ pub trait RangeInstructions<F: FieldExt>: Chip<F> {
     fn load_table(&self, layouter: &mut impl Layouter<F>) -> Result<(), Error>;
 }
 
-impl<F: FieldExt> RangeInstructions<F> for RangeChip<F> {
+impl<F: PrimeField> RangeInstructions<F> for RangeChip<F> {
     fn assign(
         &self,
         ctx: &mut RegionCtx<'_, F>,
@@ -115,7 +115,7 @@ impl<F: FieldExt> RangeInstructions<F> for RangeChip<F> {
             .collect();
 
         self.main_gate()
-            .decompose(ctx, &terms[..], F::zero(), |ctx, is_last| {
+            .decompose(ctx, &terms[..], F::ZERO, |ctx, is_last| {
                 let composition_tag =
                     self.config
                         .bit_len_tag
@@ -164,13 +164,13 @@ impl<F: FieldExt> RangeInstructions<F> for RangeChip<F> {
                     || "table tag",
                     self.config.t_tag,
                     offset,
-                    || Value::known(F::zero()),
+                    || Value::known(F::ZERO),
                 )?;
                 table.assign_cell(
                     || "table value",
                     self.config.t_value,
                     offset,
-                    || Value::known(F::zero()),
+                    || Value::known(F::ZERO),
                 )?;
                 offset += 1;
 
@@ -202,7 +202,7 @@ impl<F: FieldExt> RangeInstructions<F> for RangeChip<F> {
     }
 }
 
-impl<F: FieldExt> RangeChip<F> {
+impl<F: PrimeField> RangeChip<F> {
     /// Given config creates new chip that implements ranging
     pub fn new(config: RangeConfig) -> Self {
         let main_gate = MainGate::new(config.main_gate_config.clone());
@@ -385,11 +385,11 @@ impl<F: FieldExt> RangeChip<F> {
 mod tests {
 
     use halo2wrong::halo2::circuit::Value;
+    use halo2wrong::halo2::ff::PrimeField;
     use halo2wrong::RegionCtx;
 
     use super::{RangeChip, RangeConfig, RangeInstructions};
     use crate::curves::pasta::Fp;
-    use crate::halo2::arithmetic::FieldExt;
     use crate::halo2::circuit::{Layouter, SimpleFloorPlanner};
     use crate::halo2::dev::MockProver;
     use crate::halo2::plonk::{Circuit, ConstraintSystem, Error};
@@ -402,7 +402,7 @@ mod tests {
     }
 
     impl TestCircuitConfig {
-        fn new<F: FieldExt>(
+        fn new<F: PrimeField>(
             meta: &mut ConstraintSystem<F>,
             composition_bit_lens: Vec<usize>,
             overflow_bit_lens: Vec<usize>,
@@ -418,28 +418,28 @@ mod tests {
             Self { range_config }
         }
 
-        fn main_gate<F: FieldExt>(&self) -> MainGate<F> {
+        fn main_gate<F: PrimeField>(&self) -> MainGate<F> {
             MainGate::<F>::new(self.range_config.main_gate_config.clone())
         }
 
-        fn range_chip<F: FieldExt>(&self) -> RangeChip<F> {
+        fn range_chip<F: PrimeField>(&self) -> RangeChip<F> {
             RangeChip::<F>::new(self.range_config.clone())
         }
     }
 
     #[derive(Clone, Debug)]
-    struct Input<F: FieldExt> {
+    struct Input<F: PrimeField> {
         bit_len: usize,
         limb_bit_len: usize,
         value: Value<F>,
     }
 
     #[derive(Default, Clone, Debug)]
-    struct TestCircuit<F: FieldExt> {
+    struct TestCircuit<F: PrimeField> {
         inputs: Vec<Input<F>>,
     }
 
-    impl<F: FieldExt> TestCircuit<F> {
+    impl<F: PrimeField> TestCircuit<F> {
         fn composition_bit_lens() -> Vec<usize> {
             vec![8]
         }
@@ -449,7 +449,7 @@ mod tests {
         }
     }
 
-    impl<F: FieldExt> Circuit<F> for TestCircuit<F> {
+    impl<F: PrimeField> Circuit<F> for TestCircuit<F> {
         type Config = TestCircuitConfig;
         type FloorPlanner = SimpleFloorPlanner;
 
@@ -495,7 +495,7 @@ mod tests {
                             .zip(range_chip.bases(limb_bit_len))
                             .map(|(limb, base)| Term::Assigned(limb, *base))
                             .collect();
-                        let a_1 = main_gate.compose(ctx, &terms[..], F::zero())?;
+                        let a_1 = main_gate.compose(ctx, &terms[..], F::ZERO)?;
                         main_gate.assert_equal(ctx, &a_0, &a_1)?;
                     }
 
diff --git a/transcript/Cargo.toml b/transcript/Cargo.toml
index 34a13c88..2963040c 100644
--- a/transcript/Cargo.toml
+++ b/transcript/Cargo.toml
@@ -7,7 +7,6 @@ edition = "2021"
 [dependencies]
 ecc = { path = "../ecc", default-features = false }
 poseidon = { git = "https://github.com/privacy-scaling-explorations/poseidon.git", tag = "v2022_10_22" }
-group = "0.12"
 subtle = { version = "2.3", default-features = false }
 
 [dev-dependencies]
diff --git a/transcript/src/hasher.rs b/transcript/src/hasher.rs
index 1c002081..88bafaf2 100644
--- a/transcript/src/hasher.rs
+++ b/transcript/src/hasher.rs
@@ -1,18 +1,18 @@
 use crate::{
-    halo2::{arithmetic::FieldExt, plonk::Error},
+    halo2::{ff::PrimeField, plonk::Error},
     maingate::{AssignedValue, MainGate, MainGateConfig, MainGateInstructions, RegionCtx, Term},
 };
 use poseidon::{SparseMDSMatrix, Spec, State};
 
 /// `AssignedState` is composed of `T` sized assigned values
 #[derive(Debug, Clone)]
-pub struct AssignedState<F: FieldExt, const T: usize>(pub(super) [AssignedValue<F>; T]);
+pub struct AssignedState<F: PrimeField, const T: usize>(pub(super) [AssignedValue<F>; T]);
 
 /// `HasherChip` is basically responsible for contraining permutation part of
 /// transcript pipeline
 #[derive(Debug, Clone)]
 pub struct HasherChip<
-    F: FieldExt,
+    F: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN: usize,
     const T: usize,
@@ -25,7 +25,7 @@ pub struct HasherChip<
 }
 
 impl<
-        F: FieldExt,
+        F: PrimeField,
         const NUMBER_OF_LIMBS: usize,
         const BIT_LEN: usize,
         const T: usize,
@@ -63,7 +63,7 @@ impl<
 }
 
 impl<
-        F: FieldExt,
+        F: PrimeField,
         const NUMBER_OF_LIMBS: usize,
         const BIT_LEN: usize,
         const T: usize,
@@ -109,7 +109,7 @@ impl<
 }
 
 impl<
-        F: FieldExt,
+        F: PrimeField,
         const NUMBER_OF_LIMBS: usize,
         const BIT_LEN: usize,
         const T: usize,
@@ -185,7 +185,7 @@ impl<
                 word,
                 if i == 0 {
                     // Mark
-                    *constant + F::one()
+                    *constant + F::ONE
                 } else {
                     *constant
                 },
@@ -210,7 +210,7 @@ impl<
                     .map(|(e, word)| Term::Assigned(e, *word))
                     .collect::<Vec<Term<F>>>();
 
-                self.main_gate().compose(ctx, &terms[..], F::zero())
+                self.main_gate().compose(ctx, &terms[..], F::ZERO)
             })
             .collect::<Result<Vec<AssignedValue<F>>, Error>>()?;
 
@@ -236,7 +236,7 @@ impl<
             .zip(mds.row().iter())
             .map(|(e, word)| Term::Assigned(e, *word))
             .collect::<Vec<Term<F>>>();
-        let mut new_state = vec![self.main_gate().compose(ctx, &terms[..], F::zero())?];
+        let mut new_state = vec![self.main_gate().compose(ctx, &terms[..], F::ZERO)?];
 
         // Rest of the trainsition ie the sparse part
         for (e, word) in mds.col_hat().iter().zip(self.state.0.iter().skip(1)) {
@@ -244,9 +244,9 @@ impl<
                 ctx,
                 &[
                     Term::Assigned(&self.state.0[0], *e),
-                    Term::Assigned(word, F::one()),
+                    Term::Assigned(word, F::ONE),
                 ],
-                F::zero(),
+                F::ZERO,
             )?);
         }
 
@@ -292,7 +292,7 @@ impl<
             self.sbox_full(ctx, constants)?;
             self.apply_mds(ctx, &mds)?;
         }
-        self.sbox_full(ctx, &[F::zero(); T])?;
+        self.sbox_full(ctx, &[F::ZERO; T])?;
         self.apply_mds(ctx, &mds)?;
 
         Ok(())
diff --git a/transcript/src/transcript.rs b/transcript/src/transcript.rs
index 90b61bad..1fe09f0c 100644
--- a/transcript/src/transcript.rs
+++ b/transcript/src/transcript.rs
@@ -1,23 +1,19 @@
 use crate::{
-    halo2::{
-        arithmetic::{CurveAffine, FieldExt},
-        plonk::Error,
-    },
+    halo2::{arithmetic::CurveAffine, plonk::Error},
     hasher::HasherChip,
     maingate::{AssignedValue, RegionCtx},
 };
 use ecc::{
-    halo2::circuit::Chip,
+    halo2::{circuit::Chip, ff::PrimeField},
     maingate::{big_to_fe, decompose, fe_to_big},
     AssignedPoint, BaseFieldEccChip,
 };
-use group::ff::PrimeField;
 use poseidon::Spec;
 
 /// `PointRepresentation` will encode point with an implemented strategy
 pub trait PointRepresentation<
     C: CurveAffine<ScalarExt = N>,
-    N: FieldExt,
+    N: PrimeField,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN_LIMB: usize,
 >: Default
@@ -38,7 +34,7 @@ pub struct LimbRepresentation;
 
 impl<
         C: CurveAffine<ScalarExt = N>,
-        N: FieldExt,
+        N: PrimeField,
         const NUMBER_OF_LIMBS: usize,
         const BIT_LEN_LIMB: usize,
     > PointRepresentation<C, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB> for LimbRepresentation
@@ -74,7 +70,7 @@ pub struct NativeRepresentation;
 
 impl<
         C: CurveAffine<ScalarExt = N>,
-        N: FieldExt,
+        N: PrimeField,
         const NUMBER_OF_LIMBS: usize,
         const BIT_LEN_LIMB: usize,
     > PointRepresentation<C, N, NUMBER_OF_LIMBS, BIT_LEN_LIMB> for NativeRepresentation
@@ -103,7 +99,7 @@ impl<
 #[derive(Clone, Debug)]
 pub struct TranscriptChip<
     C: CurveAffine<ScalarExt = N>,
-    N: FieldExt,
+    N: PrimeField,
     E: PointRepresentation<C, N, NUMBER_OF_LIMBS, BIT_LEN>,
     const NUMBER_OF_LIMBS: usize,
     const BIT_LEN: usize,
@@ -117,7 +113,7 @@ pub struct TranscriptChip<
 
 impl<
         C: CurveAffine<ScalarExt = N>,
-        N: FieldExt,
+        N: PrimeField,
         E: PointRepresentation<C, N, NUMBER_OF_LIMBS, BIT_LEN>,
         const NUMBER_OF_LIMBS: usize,
         const BIT_LEN: usize,
@@ -166,9 +162,9 @@ impl<
 
 #[cfg(test)]
 mod tests {
-    use crate::halo2::arithmetic::FieldExt;
     use crate::halo2::circuit::Layouter;
     use crate::halo2::circuit::SimpleFloorPlanner;
+    use crate::halo2::ff::{Field, PrimeField};
     use crate::halo2::plonk::Error;
     use crate::halo2::plonk::{Circuit, ConstraintSystem};
     use crate::maingate::mock_prover_verify;
@@ -185,7 +181,6 @@ mod tests {
     use ecc::maingate::RangeInstructions;
     use ecc::BaseFieldEccChip;
     use ecc::EccConfig;
-    use group::ff::Field;
     use paste::paste;
     use poseidon::Poseidon;
     use poseidon::Spec;
@@ -224,7 +219,10 @@ mod tests {
             }
         }
 
-        fn config_range<N: FieldExt>(&self, layouter: &mut impl Layouter<N>) -> Result<(), Error> {
+        fn config_range<N: PrimeField>(
+            &self,
+            layouter: &mut impl Layouter<N>,
+        ) -> Result<(), Error> {
             let range_chip = RangeChip::<N>::new(self.range_config.clone());
             range_chip.load_table(layouter)?;