diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index bee47555f..1ff4c05fc 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,4 +1,4 @@
 {
-    ".": "2.20.3"
+    ".": "2.21.0"
 }
   
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 017401665..6b648e4ee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,13 @@
 [1]: https://pypi.org/project/google-cloud-pubsub/#history
 
 
+## [2.21.0](https://github.com/googleapis/python-pubsub/compare/v2.20.3...v2.21.0) (2024-03-26)
+
+
+### Features
+
+* Add custom datetime format for Cloud Storage subscriptions ([#1131](https://github.com/googleapis/python-pubsub/issues/1131)) ([4da6744](https://github.com/googleapis/python-pubsub/commit/4da67441ddab01a173620d8c03bc640271c785c6))
+
 ## [2.20.3](https://github.com/googleapis/python-pubsub/compare/v2.20.2...v2.20.3) (2024-03-21)
 
 
diff --git a/google/pubsub/gapic_version.py b/google/pubsub/gapic_version.py
index 12b6c6e02..e546bae05 100644
--- a/google/pubsub/gapic_version.py
+++ b/google/pubsub/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "2.20.3"  # {x-release-please-version}
+__version__ = "2.21.0"  # {x-release-please-version}
diff --git a/google/pubsub_v1/gapic_version.py b/google/pubsub_v1/gapic_version.py
index 12b6c6e02..e546bae05 100644
--- a/google/pubsub_v1/gapic_version.py
+++ b/google/pubsub_v1/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "2.20.3"  # {x-release-please-version}
+__version__ = "2.21.0"  # {x-release-please-version}
diff --git a/samples/generated_samples/snippet_metadata_google.pubsub.v1.json b/samples/generated_samples/snippet_metadata_google.pubsub.v1.json
index d66015ac4..b053d68de 100644
--- a/samples/generated_samples/snippet_metadata_google.pubsub.v1.json
+++ b/samples/generated_samples/snippet_metadata_google.pubsub.v1.json
@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-cloud-pubsub",
-    "version": "0.1.0"
+    "version": "2.21.0"
   },
   "snippets": [
     {