diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 76d5538..b28fea9 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.9.0"
+  ".": "0.9.1"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c51a0dc..a77dc59 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## [0.9.1](https://github.com/cachekit-io/cachekit-py/compare/v0.9.0...v0.9.1) (2026-06-15)
+
+
+### Bug Fixes
+
+* **cachekitio:** surface HTTP 413 as a clear permanent "value too large" error ([#182](https://github.com/cachekit-io/cachekit-py/issues/182)) ([d76d526](https://github.com/cachekit-io/cachekit-py/commit/d76d5263699cf892b20d0fdeb63964466fda9b55))
+* **deps:** bump pyo3 to 0.29 to clear RUSTSEC-2026-0176 and -0177 ([#183](https://github.com/cachekit-io/cachekit-py/issues/183)) ([beffbfc](https://github.com/cachekit-io/cachekit-py/commit/beffbfc1326c233549590a7b0cafb09913fd3980))
+
+
+### Security
+
+* send lock_id via X-CacheKit-Lock-Id header, not query string ([#131](https://github.com/cachekit-io/cachekit-py/issues/131)) ([#179](https://github.com/cachekit-io/cachekit-py/issues/179)) ([4cb00df](https://github.com/cachekit-io/cachekit-py/commit/4cb00dfe06bdba95c27386c3195e5819b21ab2a9))
+
 ## [0.9.0](https://github.com/cachekit-io/cachekit-py/compare/v0.8.0...v0.9.0) (2026-06-11)
 
 
diff --git a/Cargo.lock b/Cargo.lock
index 6863739..1694141 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -271,7 +271,7 @@ dependencies = [
 
 [[package]]
 name = "cachekit-rs"
-version = "0.9.0"
+version = "0.9.1"
 dependencies = [
  "cachekit-core",
  "criterion",
diff --git a/pyproject.toml b/pyproject.toml
index db73d0f..1fbc73e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "maturin"
 
 [project]
 name = "cachekit"
-version = "0.9.0"
+version = "0.9.1"
 description = "Production-ready Redis caching for Python with intelligent reliability features and Rust-powered performance"
 readme = "README.md"
 license = {text = "MIT"}
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index 42b5b05..a61d1ea 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "cachekit-rs"
-version = "0.9.0"
+version = "0.9.1"
 edition = "2021"
 authors = ["cachekit Contributors"]
 description = "High-performance storage engine for caching with compression and encryption"
diff --git a/src/cachekit/__init__.py b/src/cachekit/__init__.py
index 38671bd..b5045a1 100644
--- a/src/cachekit/__init__.py
+++ b/src/cachekit/__init__.py
@@ -68,7 +68,7 @@ def custom_function():
     ```
 """
 
-__version__ = "0.9.0"
+__version__ = "0.9.1"
 
 from collections.abc import Callable
 from typing import Any, TypeVar
diff --git a/uv.lock b/uv.lock
index 2de779e..b1d2516 100644
--- a/uv.lock
+++ b/uv.lock
@@ -230,7 +230,7 @@ filecache = [
 
 [[package]]
 name = "cachekit"
-version = "0.9.0"
+version = "0.9.1"
 source = { editable = "." }
 dependencies = [
     { name = "blake3" },