diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 5e39b94..19ee807 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.18.0"
+  ".": "0.19.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 502ab5e..fbd8ab7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.19.0](https://github.com/cachekit-io/cachekit-py/compare/v0.18.0...v0.19.0) (2026-09-06)
+
+
+### Features
+
+* **concurrency:** free-threaded CPython support — memory-ordering fixes, gil_used=false, CI lane (LAB-511) ([#265](https://github.com/cachekit-io/cachekit-py/issues/265)) ([bda770b](https://github.com/cachekit-io/cachekit-py/commit/bda770bce822d9a6eff98e555c5f6fd92e509a9c))
+
 ## [0.18.0](https://github.com/cachekit-io/cachekit-py/compare/v0.17.1...v0.18.0) (2026-09-03)
 
 
diff --git a/Cargo.lock b/Cargo.lock
index 0f7c05e..d8b4c26 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -271,7 +271,7 @@ dependencies = [
 
 [[package]]
 name = "cachekit-rs"
-version = "0.18.0"
+version = "0.19.0"
 dependencies = [
  "cachekit-core",
  "criterion",
diff --git a/pyproject.toml b/pyproject.toml
index ffe64b0..e205161 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "maturin"
 
 [project]
 name = "cachekit"
-version = "0.18.0"
+version = "0.19.0"
 description = "Backend-agnostic caching for Python — intent-based decorators with circuit breaker, distributed locking, Prometheus metrics, and optional zero-knowledge AES-256-GCM encryption, on a Rust-powered core. Zero-config L1 in-memory; scales to Redis, Memcached, File, or CachekitIO."
 readme = "README.md"
 license = {text = "MIT"}
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index cbdec4a..9b771f9 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "cachekit-rs"
-version = "0.18.0"
+version = "0.19.0"
 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 e0f9ad3..efd1a96 100644
--- a/src/cachekit/__init__.py
+++ b/src/cachekit/__init__.py
@@ -68,7 +68,7 @@ def custom_function():
     ```
 """
 
-__version__ = "0.18.0"
+__version__ = "0.19.0"
 
 from collections.abc import Callable
 from typing import Any, TypeVar
diff --git a/uv.lock b/uv.lock
index be5ed37..f503033 100644
--- a/uv.lock
+++ b/uv.lock
@@ -231,7 +231,7 @@ filecache = [
 
 [[package]]
 name = "cachekit"
-version = "0.18.0"
+version = "0.19.0"
 source = { editable = "." }
 dependencies = [
     { name = "blake3" },