diff --git a/rust-toolchain b/rust-toolchain
index 51ab4759..cb8136f6 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2022-10-28
\ No newline at end of file
+nightly-2023-04-19
\ No newline at end of file
diff --git a/snark-verifier/src/loader/halo2/shim.rs b/snark-verifier/src/loader/halo2/shim.rs
index 790c9e22..ad629624 100644
--- a/snark-verifier/src/loader/halo2/shim.rs
+++ b/snark-verifier/src/loader/halo2/shim.rs
@@ -134,6 +134,7 @@ mod halo2_lib {
         loader::halo2::{EccInstructions, IntegerInstructions},
         util::arithmetic::CurveAffine,
     };
+    use halo2_base::halo2_proofs::halo2curves::group::ff::PrimeField as _;
     use halo2_base::{
         self,
         gates::{builder::GateThreadBuilder, GateChip, GateInstructions, RangeInstructions},