diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 969d3db..a5d1cf2 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "2.1.0"
+  ".": "2.2.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8cabcfd..8d55d84 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [2.2.0](https://github.com/adcontextprotocol/adcp-client-python/compare/v2.1.0...v2.2.0) (2025-11-16)
+
+
+### Features
+
+* Add semantic type aliases for discriminated unions ([#49](https://github.com/adcontextprotocol/adcp-client-python/issues/49)) ([d776bc6](https://github.com/adcontextprotocol/adcp-client-python/commit/d776bc65277f34f3cdf85b72ec95f9759fd006a3))
+
 ## [2.1.0](https://github.com/adcontextprotocol/adcp-client-python/compare/v2.0.0...v2.1.0) (2025-11-16)
 
 
diff --git a/pyproject.toml b/pyproject.toml
index e284792..13319b7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "adcp"
-version = "2.1.0"
+version = "2.2.0"
 description = "Official Python client for the Ad Context Protocol (AdCP)"
 authors = [
     {name = "AdCP Community", email = "maintainers@adcontextprotocol.org"}
diff --git a/src/adcp/__init__.py b/src/adcp/__init__.py
index 2a95e3d..597335e 100644
--- a/src/adcp/__init__.py
+++ b/src/adcp/__init__.py
@@ -134,7 +134,7 @@
     validate_publisher_properties_item,
 )
 
-__version__ = "2.1.0"
+__version__ = "2.2.0"
 
 __all__ = [
     # Client classes