diff --git a/Cargo.toml b/Cargo.toml
index f6b96b44e..6178efaea 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,8 +15,8 @@ rust-version = "1.68"
 indexmap = { version = "2.2.3", optional = true }
 itoa = "1.0"
 memchr = { version = "2", default-features = false }
-ryu = "1.0"
 serde_core = { version = "1.0.220", default-features = false }
+zmij = "0.1.7"
 
 [target.'cfg(any())'.dependencies]
 serde = { version = "1.0.220", default-features = false }
diff --git a/src/error.rs b/src/error.rs
index fbf9eb14e..b74f4449e 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -471,7 +471,7 @@ impl<'a> Display for JsonUnexpected<'a> {
             de::Unexpected::Float(value) => write!(
                 formatter,
                 "floating point `{}`",
-                ryu::Buffer::new().format(value),
+                zmij::Buffer::new().format(value),
             ),
             unexp => Display::fmt(&unexp, formatter),
         }
diff --git a/src/number.rs b/src/number.rs
index 8cb0c3b7b..51c2d6df7 100644
--- a/src/number.rs
+++ b/src/number.rs
@@ -189,7 +189,7 @@ impl Number {
                 }
                 #[cfg(feature = "arbitrary_precision")]
                 {
-                    ryu::Buffer::new().format_finite(f).to_owned()
+                    zmij::Buffer::new().format_finite(f).to_owned()
                 }
             };
             Some(Number { n })
@@ -326,7 +326,7 @@ impl Number {
                 }
                 #[cfg(feature = "arbitrary_precision")]
                 {
-                    ryu::Buffer::new().format_finite(f).to_owned()
+                    zmij::Buffer::new().format_finite(f).to_owned()
                 }
             };
             Some(Number { n })
@@ -350,7 +350,7 @@ 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)),
         }
     }
 
@@ -556,7 +556,7 @@ macro_rules! deserialize_any {
             } else if let Some(i) = self.as_i128() {
                 return visitor.visit_i128(i);
             } else if let Some(f) = self.as_f64() {
-                if ryu::Buffer::new().format_finite(f) == self.n || f.to_string() == self.n {
+                if zmij::Buffer::new().format_finite(f) == self.n || f.to_string() == self.n {
                     return visitor.visit_f64(f);
                 }
             }
@@ -704,7 +704,7 @@ impl From<ParserNumber> for Number {
                 }
                 #[cfg(feature = "arbitrary_precision")]
                 {
-                    ryu::Buffer::new().format_finite(f).to_owned()
+                    zmij::Buffer::new().format_finite(f).to_owned()
                 }
             }
             ParserNumber::U64(u) => {
diff --git a/src/ser.rs b/src/ser.rs
index 50c06f938..053f95a29 100644
--- a/src/ser.rs
+++ b/src/ser.rs
@@ -1692,7 +1692,7 @@ pub trait Formatter {
     where
         W: ?Sized + io::Write,
     {
-        let mut buffer = ryu::Buffer::new();
+        let mut buffer = zmij::Buffer::new();
         let s = buffer.format_finite(value);
         writer.write_all(s.as_bytes())
     }
@@ -1717,7 +1717,7 @@ pub trait Formatter {
     where
         W: ?Sized + io::Write,
     {
-        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/value/ser.rs b/src/value/ser.rs
index 1ffe7b7f1..d5e2e84f6 100644
--- a/src/value/ser.rs
+++ b/src/value/ser.rs
@@ -531,7 +531,7 @@ impl serde::Serializer for MapKeySerializer {
 
     fn serialize_f32(self, value: f32) -> Result<String> {
         if value.is_finite() {
-            Ok(ryu::Buffer::new().format_finite(value).to_owned())
+            Ok(zmij::Buffer::new().format_finite(value).to_owned())
         } else {
             Err(float_key_must_be_finite())
         }
@@ -539,7 +539,7 @@ impl serde::Serializer for MapKeySerializer {
 
     fn serialize_f64(self, value: f64) -> Result<String> {
         if value.is_finite() {
-            Ok(ryu::Buffer::new().format_finite(value).to_owned())
+            Ok(zmij::Buffer::new().format_finite(value).to_owned())
         } else {
             Err(float_key_must_be_finite())
         }
diff --git a/tests/debug.rs b/tests/debug.rs
index adf475d93..b804d8d57 100644
--- a/tests/debug.rs
+++ b/tests/debug.rs
@@ -30,7 +30,7 @@ fn value_number() {
     assert_eq!(format!("{:?}", json!(-1)), "Number(-1)");
     assert_eq!(format!("{:?}", json!(1.0)), "Number(1.0)");
     assert_eq!(Number::from_f64(1.0).unwrap().to_string(), "1.0"); // not just "1"
-    assert_eq!(Number::from_f64(12e40).unwrap().to_string(), "1.2e41");
+    assert_eq!(Number::from_f64(12e40).unwrap().to_string(), "1.2e+41");
 }
 
 #[test]
diff --git a/tests/test.rs b/tests/test.rs
index f608679e6..f371f6f58 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -148,8 +148,8 @@ fn test_write_f64() {
         (3.1, "3.1"),
         (-1.5, "-1.5"),
         (0.5, "0.5"),
-        (f64::MIN, "-1.7976931348623157e308"),
-        (f64::MAX, "1.7976931348623157e308"),
+        (f64::MIN, "-1.7976931348623157e+308"),
+        (f64::MAX, "1.7976931348623157e+308"),
         (f64::EPSILON, "2.220446049250313e-16"),
     ];
     test_encode_ok(tests);