diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1fa703b..d266946 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Release notes
 
+## 0.4.2 (2024-07-05)
+
+### Bug Fixes
+
+- Add missing `CnRx` `CnRz` ops ([#49](https://github.com/CQCL/tket-json-rs/pull/49))
+- Matrix encoding roundtrip losing precision. Use `f64` instead of `f32`s. ([#48](https://github.com/CQCL/tket-json-rs/pull/48))
+
+
 ## 0.4.1 (2024-04-16)
 
 ### Bug Fixes
diff --git a/Cargo.toml b/Cargo.toml
index d06402d..cb9c0cb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "tket-json-rs"
-version = "0.4.1"
+version = "0.4.2"
 license = "Apache-2.0"
 edition = "2021"
 rust-version = "1.70"