diff --git a/hugr/CHANGELOG.md b/hugr/CHANGELOG.md
index 94525e742..5b36d458e 100644
--- a/hugr/CHANGELOG.md
+++ b/hugr/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## 0.3.1 (2024-04-23)
+
+### Features
+
+- `new` methods for leaf ops ([#940](https://github.com/CQCL/hugr/pull/940))
+- `CustomOp::extension` utility function ([#951](https://github.com/CQCL/hugr/pull/951))
+- Encoder metadata in serialized hugr ([#955](https://github.com/CQCL/hugr/pull/955))
+
+### Testing
+
+- Add a test of instantiating an extension set ([#939](https://github.com/CQCL/hugr/pull/939))
+
+
 ## 0.3.0 (2024-04-15)
 
 ### Main changes
diff --git a/hugr/Cargo.toml b/hugr/Cargo.toml
index c97432be1..072970b5f 100644
--- a/hugr/Cargo.toml
+++ b/hugr/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "hugr"
-version = "0.3.0"
+version = "0.3.1"
 edition = { workspace = true }
 rust-version = { workspace = true }