diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 89652a3..d4f6f29 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "2.19.0"
+  ".": "3.0.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d86d6aa..5dc932b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,16 @@
 # Changelog
 
+## [3.0.0](https://github.com/adcontextprotocol/adcp-client-python/compare/v2.19.0...v3.0.0) (2026-01-26)
+
+
+### ⚠ BREAKING CHANGES
+
+* CpmAuctionPricingOption, CpmFixedRatePricingOption, VcpmAuctionPricingOption, VcpmFixedRatePricingOption have been consolidated into CpmPricingOption and VcpmPricingOption respectively.
+
+### Features
+
+* add V3 protocol support (Governance, Content Standards, SI, CLI) ([#117](https://github.com/adcontextprotocol/adcp-client-python/issues/117)) ([dfec179](https://github.com/adcontextprotocol/adcp-client-python/commit/dfec179ac58eb14f9a69ce939d4d5fe048bb6b04))
+
 ## [2.19.0](https://github.com/adcontextprotocol/adcp-client-python/compare/v2.18.0...v2.19.0) (2026-01-14)
 
 
diff --git a/pyproject.toml b/pyproject.toml
index 6ec182e..bd19186 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "adcp"
-version = "2.19.0"
+version = "3.0.0"
 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 666249f..c53d0ef 100644
--- a/src/adcp/__init__.py
+++ b/src/adcp/__init__.py
@@ -193,7 +193,7 @@
     get_adcp_signed_headers_for_webhook,
 )
 
-__version__ = "2.19.0"
+__version__ = "3.0.0"
 
 
 def get_adcp_version() -> str: