diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 8c563a6..788b0fa 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.21.3"
+  ".": "0.22.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab79ed8..51f30e3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## Unreleased
+## [0.22.0](https://github.com/Usefused/harnest/compare/v0.21.3...v0.22.0) (2026-09-16)
 
 ### Features
 
@@ -32,6 +32,11 @@
   positioning. Apply the same option styling to the searchable session picker,
   keep its menu inside phone screens, and preserve a readable mobile trigger.
 
+### Features
+
+* add agent Studio and eval authoring to the playground ([4983ced](https://github.com/Usefused/harnest/commit/4983cedab88f7aad7f406c5a71888bd4e9de672c))
+* **mcp:** add runtime OpenAPI clients and Fused integration ([3cdf066](https://github.com/Usefused/harnest/commit/3cdf066f89bfa8459144bde84cc31dd24e3e411d))
+
 ## [0.21.3](https://github.com/Usefused/harnest/compare/v0.21.2...v0.21.3) (2026-09-15)
 
 ### Fixes
diff --git a/pyproject.toml b/pyproject.toml
index 7f680c9..a866f91 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "harnest"
-version = "0.21.3"
+version = "0.22.0"
 description = "Filesystem-first Python authoring SDK for ADK and LangGraph agents"
 readme = "README.md"
 requires-python = ">=3.10"
diff --git a/src/harnest/compatibility.py b/src/harnest/compatibility.py
index 9eb0c3a..d370bbc 100644
--- a/src/harnest/compatibility.py
+++ b/src/harnest/compatibility.py
@@ -16,7 +16,7 @@
 from packaging.version import InvalidVersion, Version
 
 
-_SOURCE_VERSION = "0.21.3"  # x-release-please-version
+_SOURCE_VERSION = "0.22.0"  # x-release-please-version
 
 
 @dataclass(frozen=True, slots=True)