diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 9e4f1370..d14ac5d7 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,5 +1,5 @@
 {
     "tket2-py": "0.6.1",
     "tket2-eccs": "0.3.0",
-    "tket2-exts": "0.4.0"
+    "tket2-exts": "0.5.0"
 }
diff --git a/tket2-exts/CHANGELOG.md b/tket2-exts/CHANGELOG.md
index e2347059..7b28d6f5 100644
--- a/tket2-exts/CHANGELOG.md
+++ b/tket2-exts/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## [0.5.0](https://github.com/CQCL/tket2/compare/tket2-exts-v0.4.0...tket2-exts-v0.5.0) (2025-03-04)
+
+
+### ⚠ BREAKING CHANGES
+
+* To be compatible with Guppy's convention of implicitly returning `self` as the second value of the tuple, the following signatures are updated: ```diff
+    -    /// `fn random_int(RNGContext) -> (RNGContext, u32)`
+    +   /// `fn random_int(RNGContext) -> (u32, RNGContext)`
+
+### Bug Fixes
+
+* remove type argument from `RNGContext` type, swap returns ([#786](https://github.com/CQCL/tket2/issues/786)) ([633ebd7](https://github.com/CQCL/tket2/commit/633ebd74d71ba81f5b71d6db757b08ea3c959a5d))
+
 ## [0.4.0](https://github.com/CQCL/tket2/compare/tket2-exts-v0.3.0...tket2-exts-v0.4.0) (2025-02-20)
 
 
diff --git a/tket2-exts/pyproject.toml b/tket2-exts/pyproject.toml
index d8d32648..535886dc 100644
--- a/tket2-exts/pyproject.toml
+++ b/tket2-exts/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "tket2-exts"
-version = "0.4.0"
+version = "0.5.0"
 requires-python = ">=3.10"
 description = "HUGR extension definitions for the tket2 compiler."
 license = { file = "LICENCE" }
diff --git a/tket2-exts/src/tket2_exts/__init__.py b/tket2-exts/src/tket2_exts/__init__.py
index f3714e69..5419d0e5 100644
--- a/tket2-exts/src/tket2_exts/__init__.py
+++ b/tket2-exts/src/tket2_exts/__init__.py
@@ -8,7 +8,7 @@
 
 # This is updated by our release-please workflow, triggered by this
 # annotation: x-release-please-version
-__version__ = "0.4.0"
+__version__ = "0.5.0"
 
 
 @functools.cache