diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index d8e626ad..69ea3514 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,4 +1,4 @@
 {
-    "tket2-py": "0.3.0",
+    "tket2-py": "0.4.0",
     "tket2-eccs": "0.1.0"
 }
\ No newline at end of file
diff --git a/tket2-py/CHANGELOG.md b/tket2-py/CHANGELOG.md
index 4d36bc06..83972ebd 100644
--- a/tket2-py/CHANGELOG.md
+++ b/tket2-py/CHANGELOG.md
@@ -1,5 +1,23 @@
 # Changelog
 
+## [0.4.0](https://github.com/CQCL/tket2/compare/tket2-py-v0.3.0...tket2-py-v0.4.0) (2024-10-01)
+
+
+### ⚠ BREAKING CHANGES
+
+* "tket2.angle" extension replaced with "tket2.rotation" extension with rotation type and simplified set of operations.
+
+### Features
+
+* `BadgerOptimiser.load_precompiled`, `BadgerOptimiser.compile_eccs` and `passes.badger_pass` now take an optional `cost_fn` parameter to specify the cost function to minimise. Supported values are `'cx'` (default behaviour) and `'rz'`. ([83ebfcb](https://github.com/CQCL/tket2/commit/83ebfcb9156fb5516f877155939062d11c7196d5))
+* simplify angle extension in to a half turns rotation type ([#611](https://github.com/CQCL/tket2/issues/611)) ([0723937](https://github.com/CQCL/tket2/commit/0723937a8aed69302359fbd2383a01a77adc6b36))
+
+
+### Bug Fixes
+
+* Support hugr packages, fix the notebooks ([#622](https://github.com/CQCL/tket2/issues/622)) ([1cf9dcb](https://github.com/CQCL/tket2/commit/1cf9dcb7ba80dd236916bcf86a1fa0f5459fd349))
+
+
 ## [0.3.0](https://github.com/CQCL/tket2/compare/tket2-py-v0.2.1...tket2-py-v0.3.0) (2024-09-04)
 
 
diff --git a/tket2-py/examples/1-Getting-Started.ipynb b/tket2-py/examples/1-Getting-Started.ipynb
index 5a540ed8..63be3482 100644
--- a/tket2-py/examples/1-Getting-Started.ipynb
+++ b/tket2-py/examples/1-Getting-Started.ipynb
@@ -55,8 +55,8 @@
     "\n",
     "# Uncomment one of these lines depending on whether you are using a published\n",
     "# version of tket2 or a local build.\n",
-    "#!uv pip install \"tket2>=0.4.0,<0.5\"\n",
-    "!cd ../../ && maturin develop --quiet --uv"
+    "!uv pip install \"tket2>=0.4.0,<0.5\"\n",
+    "#!cd ../../ && maturin develop --quiet --uv"
    ]
   },
   {
diff --git a/tket2-py/examples/2-Rewriting-Circuits.ipynb b/tket2-py/examples/2-Rewriting-Circuits.ipynb
index 512b1f63..b1367ccd 100644
--- a/tket2-py/examples/2-Rewriting-Circuits.ipynb
+++ b/tket2-py/examples/2-Rewriting-Circuits.ipynb
@@ -29,7 +29,7 @@
    "source": [
     "!uv pip install \\\n",
     "    \"pytket>=1.30.0,<2\" \\\n",
-    "    \"tket2>=0.3.0,<0.4\" \\\n",
+    "    \"tket2>=0.4.0,<0.5\" \\\n",
     "    \"guppylang>=0.10.0,<0.11\" \\\n",
     "    \"hugr>=0.8.1,<0.9\""
    ]
diff --git a/tket2-py/pyproject.toml b/tket2-py/pyproject.toml
index 6e5af4ff..f4219037 100644
--- a/tket2-py/pyproject.toml
+++ b/tket2-py/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "tket2"
-version = "0.3.0"
+version = "0.4.0"
 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 ca065ce8..2a2d55a7 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__ = "0.3.0"
+__version__ = "0.4.0"
diff --git a/uv.lock b/uv.lock
index db059f7f..45f6243c 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,7 +1,5 @@
 version = 1
 requires-python = ">=3.10, <3.13"
-resolution-markers = [
-]
 
 [manifest]
 members = [
@@ -782,7 +780,7 @@ wheels = [
 
 [[package]]
 name = "tket2"
-version = "0.3.0"
+version = "0.4.0"
 source = { editable = "tket2-py" }
 dependencies = [
     { name = "hugr" },