diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 38b68dc5..65c58e81 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,4 +1,4 @@
 {
-    "tket2-py": "0.4.0",
+    "tket2-py": "0.4.1",
     "tket2-eccs": "0.2.0"
 }
\ No newline at end of file
diff --git a/tket2-py/CHANGELOG.md b/tket2-py/CHANGELOG.md
index 83972ebd..15805ab5 100644
--- a/tket2-py/CHANGELOG.md
+++ b/tket2-py/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.4.1](https://github.com/CQCL/tket2/compare/tket2-py-v0.4.0...tket2-py-v0.4.1) (2024-10-10)
+
+
+### Features
+
+* Add `tket2.rotation.from_halfturns_unchecked` op ([#640](https://github.com/CQCL/tket2/issues/640)) ([86ffe64](https://github.com/CQCL/tket2/commit/86ffe64fa455fc19a60999a7edb71803d615d77b))
+
 ## [0.4.0](https://github.com/CQCL/tket2/compare/tket2-py-v0.3.0...tket2-py-v0.4.0) (2024-10-01)
 
 
diff --git a/tket2-py/pyproject.toml b/tket2-py/pyproject.toml
index 9316697b..348e99dd 100644
--- a/tket2-py/pyproject.toml
+++ b/tket2-py/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "tket2"
-version = "0.4.0"
+version = "0.4.1"
 requires-python = ">=3.10,<3.13"
 description = "Quantinuum's TKET2 Quantum Compiler"
 license = { file = "LICENCE" }
diff --git a/tket2-py/tket2/__init__.py b/tket2-py/tket2/__init__.py
index 2a2d55a7..3fcf28cf 100644
--- a/tket2-py/tket2/__init__.py
+++ b/tket2-py/tket2/__init__.py
@@ -16,4 +16,4 @@
 
 # This is updated by our release-please workflow, triggered by this
 # annotation: x-release-please-version
-__version__ = "0.4.0"
+__version__ = "0.4.1"
diff --git a/uv.lock b/uv.lock
index 1adad6b6..cd404b6c 100644
--- a/uv.lock
+++ b/uv.lock
@@ -780,7 +780,7 @@ wheels = [
 
 [[package]]
 name = "tket2"
-version = "0.4.0"
+version = "0.4.1"
 source = { editable = "tket2-py" }
 dependencies = [
     { name = "hugr" },