diff --git a/Cargo.lock b/Cargo.lock
index d5eaf743..952451dd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1892,7 +1892,7 @@ dependencies = [
 
 [[package]]
 name = "tket2"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "bytemuck",
  "cgmath",
@@ -1934,7 +1934,7 @@ dependencies = [
 
 [[package]]
 name = "tket2-hseries"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "clap",
  "cool_asserts",
diff --git a/tket2-hseries/CHANGELOG.md b/tket2-hseries/CHANGELOG.md
index 1eb4486d..ef3ed5e6 100644
--- a/tket2-hseries/CHANGELOG.md
+++ b/tket2-hseries/CHANGELOG.md
@@ -6,6 +6,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.4.0](https://github.com/CQCL/tket2/compare/tket2-hseries-v0.3.0...tket2-hseries-v0.4.0) - 2024-09-16
+
+### New Features
+
+- [**breaking**] `HSeriesPass` lowers `Tk2Op`s into `HSeriesOp`s ([#602](https://github.com/CQCL/tket2/pull/602))
+- [**breaking**] simplify angle extension in to a half turns rotation type ([#611](https://github.com/CQCL/tket2/pull/611))
+
 ## [0.3.0](https://github.com/CQCL/tket2/compare/tket2-hseries-v0.2.0...tket2-hseries-v0.3.0) - 2024-09-09
 
 ### Bug Fixes
diff --git a/tket2-hseries/Cargo.toml b/tket2-hseries/Cargo.toml
index 82ad4298..d3047b97 100644
--- a/tket2-hseries/Cargo.toml
+++ b/tket2-hseries/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "tket2-hseries"
-version = "0.3.0"
+version = "0.4.0"
 edition.workspace = true
 rust-version.workspace = true
 
@@ -23,7 +23,7 @@ required-features = ["cli"]
 
 [dependencies]
 hugr.workspace = true
-tket2 = { path = "../tket2", version = "0.3.0" }
+tket2 = { path = "../tket2", version = "0.4.0" }
 lazy_static.workspace = true
 serde = { workspace = true, features = ["derive"] }
 serde_json.workspace = true
diff --git a/tket2-py/Cargo.toml b/tket2-py/Cargo.toml
index 7627b24c..3c2e8b1b 100644
--- a/tket2-py/Cargo.toml
+++ b/tket2-py/Cargo.toml
@@ -19,7 +19,7 @@ test = false
 bench = false
 
 [dependencies]
-tket2 = { path = "../tket2", version = "0.3.0", features = [
+tket2 = { path = "../tket2", version = "0.4.0", features = [
     "portmatching",
     "binary-eccs",
 ] }
diff --git a/tket2/CHANGELOG.md b/tket2/CHANGELOG.md
index b59b0282..a1cb9476 100644
--- a/tket2/CHANGELOG.md
+++ b/tket2/CHANGELOG.md
@@ -6,6 +6,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.4.0](https://github.com/CQCL/tket2/compare/tket2-v0.3.0...tket2-v0.4.0) - 2024-09-16
+
+### Bug Fixes
+
+- angle type docstring to say 2pi ([#607](https://github.com/CQCL/tket2/pull/607))
+- Fix broken ConstAngle::TAU ([#609](https://github.com/CQCL/tket2/pull/609))
+
+### New Features
+
+- [**breaking**] simplify angle extension in to a half turns rotation type ([#611](https://github.com/CQCL/tket2/pull/611))
+
 ## [0.3.0](https://github.com/CQCL/tket2/compare/tket2-v0.2.0...tket2-v0.3.0) - 2024-09-09
 
 ### Bug Fixes
diff --git a/tket2/Cargo.toml b/tket2/Cargo.toml
index bf78fc72..a74a16f3 100644
--- a/tket2/Cargo.toml
+++ b/tket2/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "tket2"
-version = "0.3.0"
+version = "0.4.0"
 edition = { workspace = true }
 rust-version = { workspace = true }