diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a1d34f3d..5250eb2ae 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 # Changelog
 
+## [1.66.0](https://github.com/googleapis/python-genai/compare/v1.65.0...v1.66.0) (2026-03-03)
+
+
+### Features
+
+* Add gemini-3.1-flash-image-preview model ([dd52cc2](https://github.com/googleapis/python-genai/commit/dd52cc288be297e74cb689be9260b917ea90e06b))
+* Support signature for all Interaction tool types ([abb388e](https://github.com/googleapis/python-genai/commit/abb388e9058fd8fa0d53bc0b265d68ce93a6f184))
+* Update data types from discovery doc. ([15666c0](https://github.com/googleapis/python-genai/commit/15666c063488fcb4589624ef44b4c80281a9ee7b))
+
 ## [1.65.0](https://github.com/googleapis/python-genai/compare/v1.64.0...v1.65.0) (2026-02-26)
 
 
diff --git a/google/genai/version.py b/google/genai/version.py
index be04a91b7..7f80ed71e 100644
--- a/google/genai/version.py
+++ b/google/genai/version.py
@@ -13,4 +13,4 @@
 # limitations under the License.
 #
 
-__version__ = '1.65.0' # x-release-please-version
+__version__ = '1.66.0' # x-release-please-version
diff --git a/pyproject.toml b/pyproject.toml
index 3dd6e6e06..e65d5fc3e 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 = "1.65.0"
+version = "1.66.0"
 description = "GenAI Python SDK"
 readme = "README.md"
 license = "Apache-2.0"