diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 94669220c..ad7af3a9d 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,4 +1,4 @@
 {
-  "guppylang": "0.21.5",
+  "guppylang": "0.21.6",
   "guppylang-internals": "0.25.0"
 }
diff --git a/guppylang/CHANGELOG.md b/guppylang/CHANGELOG.md
index c5fd836e5..72fe28ba6 100644
--- a/guppylang/CHANGELOG.md
+++ b/guppylang/CHANGELOG.md
@@ -14,6 +14,15 @@ This changelog documents user-facing changes to the Guppy language excluding cha
 
 As of August 2025, The Guppy language is undergoing rapid development and is currently unstable. There is a Guppy v1.0 stability [milestone](https://github.com/CQCL/guppylang/milestone/12) that is a work in progress and subject to change.
 
+## [0.21.6](https://github.com/CQCL/guppylang/compare/guppylang-v0.21.5...guppylang-v0.21.6) (2025-10-29)
+
+
+### Features
+
+* implement str() for PartialVector  ([d85efc9](https://github.com/CQCL/guppylang/commit/d85efc971c81f60eb6e7f2881623803ff45b43d1)), closes [#1225](https://github.com/CQCL/guppylang/issues/1225)
+* **qsystem:** add `RNG.random_advance()` ([#1295](https://github.com/CQCL/guppylang/issues/1295)) ([f6271a2](https://github.com/CQCL/guppylang/commit/f6271a29768241e6e285f05c3eb3ccd2db9d12ac))
+* Use `borrow_array` instead of `value_array` for array HUGR codegen ([#1166](https://github.com/CQCL/guppylang/issues/1166)) ([f9ef42b](https://github.com/CQCL/guppylang/commit/f9ef42b2baf61c3e1c2cfcf7bd1f3bcac33a1a25))
+
 ## [0.21.5](https://github.com/CQCL/guppylang/compare/guppylang-v0.21.4...guppylang-v0.21.5) (2025-09-22)
 
 > [!WARNING]  
diff --git a/guppylang/pyproject.toml b/guppylang/pyproject.toml
index bdfeaeafe..da295708e 100644
--- a/guppylang/pyproject.toml
+++ b/guppylang/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "guppylang"
-version = "0.21.5"
+version = "0.21.6"
 requires-python = ">=3.10,<4"
 description = "Pythonic quantum-classical programming language"
 license = { file = "LICENCE" }
diff --git a/guppylang/src/guppylang/__init__.py b/guppylang/src/guppylang/__init__.py
index fb194ea9a..1e37d8766 100644
--- a/guppylang/src/guppylang/__init__.py
+++ b/guppylang/src/guppylang/__init__.py
@@ -15,4 +15,4 @@
 
 # This is updated by our release-please workflow, triggered by this
 # annotation: x-release-please-version
-__version__ = "0.21.5"
+__version__ = "0.21.6"
diff --git a/uv.lock b/uv.lock
index 829e19043..8147a170f 100644
--- a/uv.lock
+++ b/uv.lock
@@ -945,7 +945,7 @@ wheels = [
 
 [[package]]
 name = "guppylang"
-version = "0.21.5"
+version = "0.21.6"
 source = { editable = "guppylang" }
 dependencies = [
     { name = "guppylang-internals" },