diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 5fdd8830..c3f14639 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.1.0"
+  ".": "1.2.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 594ac5e1..23e657d8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [1.2.0](https://github.com/adcontextprotocol/adcp-client-python/compare/v1.1.0...v1.2.0) (2025-11-08)
+
+
+### Features
+
+* improve type generation with discriminated union support ([#21](https://github.com/adcontextprotocol/adcp-client-python/issues/21)) ([54da596](https://github.com/adcontextprotocol/adcp-client-python/commit/54da5967f0962b814460ce53fc35494af2f023b6))
+
 ## [1.1.0](https://github.com/adcontextprotocol/adcp-client-python/compare/v1.0.5...v1.1.0) (2025-11-07)
 
 
diff --git a/pyproject.toml b/pyproject.toml
index 4b129765..e776206d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "adcp"
-version = "1.1.0"
+version = "1.2.0"
 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 15803a4a..059b8493 100644
--- a/src/adcp/__init__.py
+++ b/src/adcp/__init__.py
@@ -46,7 +46,7 @@
     UpdateMediaBuyResponse,
 )
 
-__version__ = "1.1.0"
+__version__ = "1.2.0"
 
 __all__ = [
     # Client classes