diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8e4a2e2db..774819bad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,35 @@
 # Changelog
 
+## [2.9.0](https://github.com/googleapis/python-genai/compare/v2.8.0...v2.9.0) (2026-06-12)
+
+
+### Features
+
+* Add ServiceTier to UsageMetadata ([45b4963](https://github.com/googleapis/python-genai/commit/45b4963f4cdc8dc01cffe85260c629e50595fbf9))
+* Gemma 4 local tokenizer support ([ca97c58](https://github.com/googleapis/python-genai/commit/ca97c5805666f6386d0148848132c07ce81e2c72))
+* **interaction-api:** Add `model` field and `CodeMenderAgentData` response message ([4750c75](https://github.com/googleapis/python-genai/commit/4750c75129a6261abeca5b348667a55fcaf98e07))
+* **interaction-api:** Add CodeMenderAgentConfig to the Interactions API AgentInteraction proto ([3900799](https://github.com/googleapis/python-genai/commit/39007990d1502f4daa8ed6f8642947437b6535f1))
+* **interaction-api:** Add presence_penalty, frequency_penalty, and cached_content to models.proto ([05f16fe](https://github.com/googleapis/python-genai/commit/05f16fea01d4c8bdc4d6ac9c2b7bbed11ada3aee))
+* **interaction-api:** Rename usage to total_usage in StreamMetadata. ([7c331c6](https://github.com/googleapis/python-genai/commit/7c331c6c40825cbbbd7cfc354357c171bdf395f5))
+* Introduce gaos sdk libs ([8e48cd1](https://github.com/googleapis/python-genai/commit/8e48cd19801c14270016fb4de5aec596e57fbbd1))
+* Introduce gaos sdk libs ([8972ca7](https://github.com/googleapis/python-genai/commit/8972ca73005fc59555ad3f857d0cbb9add5c902a))
+
+
+### Bug Fixes
+
+* Add fallback for `aiohttp.readline` without `max_line_length` for backward compatibility because we still want to keep aiohttp as optional dependency ([e99ab99](https://github.com/googleapis/python-genai/commit/e99ab99d63625b2f383a08f5fb91812c096f1c2b)), closes [#2487](https://github.com/googleapis/python-genai/issues/2487)
+* Fix header ([f8f9749](https://github.com/googleapis/python-genai/commit/f8f97496965795469888b93f3c70d6ea08296a83))
+* Keep live music API keys out of websocket urls ([#2564](https://github.com/googleapis/python-genai/issues/2564)) ([c754ebf](https://github.com/googleapis/python-genai/commit/c754ebf3973fde9894b24c2425cee67eb2d03b64))
+* Make `transformers` an optional dependency for local tokenizers, also add other dependencies to local-tokenizer-extras. ([528926b](https://github.com/googleapis/python-genai/commit/528926b5a94fb6590846e739e643895016d2c0d0))
+* Use .model_copy() instead of deprecated .copy() ([216369f](https://github.com/googleapis/python-genai/commit/216369f519712285db0902f0b248be3c4faf664c))
+
+
+### Documentation
+
+* Announce Automatic Function Calling (AFC) upcoming breaking change warning ([4697258](https://github.com/googleapis/python-genai/commit/4697258417902a5d0074a2247db34bfdf40e5468))
+* Clarify Live API START/END_SENSITIVITY_HIGH/LOW defaults are different in Gemini Live and Gemini Enterprise Agent Platform Live API ([a0ec6ab](https://github.com/googleapis/python-genai/commit/a0ec6abc8f54f9cfc110e9b1dd3271971961f193)), closes [#2555](https://github.com/googleapis/python-genai/issues/2555)
+* Regenerate docs for 2.8.0 ([93e7ab1](https://github.com/googleapis/python-genai/commit/93e7ab1e8851dd68e59368d49bc2e3695dfd5148))
+
 ## [2.8.0](https://github.com/googleapis/python-genai/compare/v2.7.0...v2.8.0) (2026-06-03)
 
 
diff --git a/google/genai/version.py b/google/genai/version.py
index 950456342..a90b72bfa 100644
--- a/google/genai/version.py
+++ b/google/genai/version.py
@@ -13,4 +13,4 @@
 # limitations under the License.
 #
 
-__version__ = '2.8.0' # x-release-please-version
+__version__ = '2.9.0' # x-release-please-version
diff --git a/pyproject.toml b/pyproject.toml
index 712bc7ccd..2e90e4035 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,7 +3,7 @@ requires = ["setuptools", "wheel", "twine>=6.1.0", "packaging>=24.2", "pkginfo>=
 
 [project]
 name = "google-genai"
-version = "2.8.0"
+version = "2.9.0"
 description = "GenAI Python SDK"
 readme = "README.md"
 license = "Apache-2.0"