diff --git a/Cargo.toml b/Cargo.toml
index 4112826..7e5effb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,7 +22,7 @@ cfg-if       = "1.0"
 faststr      = { version = "0.2", features = ["serde"] }
 itoa         = "1.0"
 ref-cast     = "1.0"
-ryu          = "1.0"
+zmij         = "0.1"
 serde        = { version = "1.0", features = ["rc", "derive"] }
 simdutf8     = "0.1"
 sonic-number = { path = "./sonic-number", version = "0.1" }
diff --git a/src/format.rs b/src/format.rs
index 539c5c7..b8b5c29 100644
--- a/src/format.rs
+++ b/src/format.rs
@@ -152,7 +152,7 @@ pub trait Formatter: Clone {
             return self.write_i64(writer, value as i64);
         }
 
-        let mut buffer = ryu::Buffer::new();
+        let mut buffer = zmij::Buffer::new();
         let s = buffer.format_finite(value);
         writer.write_all(s.as_bytes())
     }
@@ -168,7 +168,7 @@ pub trait Formatter: Clone {
             return self.write_i64(writer, value as i64);
         }
 
-        let mut buffer = ryu::Buffer::new();
+        let mut buffer = zmij::Buffer::new();
         let s = buffer.format_finite(value);
         writer.write_all(s.as_bytes())
     }
diff --git a/src/serde/number.rs b/src/serde/number.rs
index 01c5723..51a871e 100644
--- a/src/serde/number.rs
+++ b/src/serde/number.rs
@@ -175,7 +175,7 @@ impl Display for Number {
         match self.n {
             N::PosInt(u) => formatter.write_str(itoa::Buffer::new().format(u)),
             N::NegInt(i) => formatter.write_str(itoa::Buffer::new().format(i)),
-            N::Float(f) => formatter.write_str(ryu::Buffer::new().format_finite(f)),
+            N::Float(f) => formatter.write_str(zmij::Buffer::new().format_finite(f)),
         }
     }
 }
diff --git a/src/serde/ser.rs b/src/serde/ser.rs
index 7933e3f..16265be 100644
--- a/src/serde/ser.rs
+++ b/src/serde/ser.rs
@@ -977,7 +977,7 @@ impl serde::Serializer for SortedKeySerializer {
 
     fn serialize_f32(self, value: f32) -> Result<String> {
         if value.is_finite() {
-            let mut buf = ryu::Buffer::new();
+            let mut buf = zmij::Buffer::new();
             Ok(buf.format_finite(value).to_owned())
         } else {
             Err(key_must_be_str_or_num(Unexpected::Other(
@@ -988,7 +988,7 @@ impl serde::Serializer for SortedKeySerializer {
 
     fn serialize_f64(self, value: f64) -> Result<String> {
         if value.is_finite() {
-            let mut buf = ryu::Buffer::new();
+            let mut buf = zmij::Buffer::new();
             Ok(buf.format_finite(value).to_owned())
         } else {
             Err(key_must_be_str_or_num(Unexpected::Other(
diff --git a/src/value/ser.rs b/src/value/ser.rs
index c39d8aa..8e1b1f5 100644
--- a/src/value/ser.rs
+++ b/src/value/ser.rs
@@ -537,7 +537,7 @@ impl serde::Serializer for MapKeySerializer {
 
     fn serialize_f32(self, value: f32) -> Result<Value> {
         if value.is_finite() {
-            self.serialize_str(ryu::Buffer::new().format_finite(value))
+            self.serialize_str(zmij::Buffer::new().format_finite(value))
         } else {
             Err(float_key_must_be_finite())
         }
@@ -545,7 +545,7 @@ impl serde::Serializer for MapKeySerializer {
 
     fn serialize_f64(self, value: f64) -> Result<Value> {
         if value.is_finite() {
-            self.serialize_str(ryu::Buffer::new().format_finite(value))
+            self.serialize_str(zmij::Buffer::new().format_finite(value))
         } else {
             Err(float_key_must_be_finite())
         }