diff --git a/CHANGELOG.md b/CHANGELOG.md
index a0539af01e..3528411692 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,13 @@
 
 [1]: https://pypi.org/project/bigframes/#history
 
+## [1.21.0](https://github.com/googleapis/python-bigquery-dataframes/compare/v1.20.0...v1.21.0) (2024-09-27)
+
+
+### Features
+
+* Add ml.model_selection.cross_validate support ([#1020](https://github.com/googleapis/python-bigquery-dataframes/issues/1020)) ([1a38063](https://github.com/googleapis/python-bigquery-dataframes/commit/1a380631f793f82637cd384601956ee4457dc58a))
+
 ## [1.20.0](https://github.com/googleapis/python-bigquery-dataframes/compare/v1.19.0...v1.20.0) (2024-09-25)
 
 
diff --git a/bigframes/version.py b/bigframes/version.py
index 60f4942175..c07f26bc6f 100644
--- a/bigframes/version.py
+++ b/bigframes/version.py
@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "1.20.0"
+__version__ = "1.21.0"
diff --git a/third_party/bigframes_vendored/version.py b/third_party/bigframes_vendored/version.py
index 60f4942175..c07f26bc6f 100644
--- a/third_party/bigframes_vendored/version.py
+++ b/third_party/bigframes_vendored/version.py
@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "1.20.0"
+__version__ = "1.21.0"