diff --git a/.librarian/state.yaml b/.librarian/state.yaml
index 9a7ad85b3..286fb52ef 100644
--- a/.librarian/state.yaml
+++ b/.librarian/state.yaml
@@ -1,7 +1,7 @@
 image: us-central1-docker.pkg.dev/cloud-sdk-librarian-prod/images-prod/python-librarian-generator@sha256:b8058df4c45e9a6e07f6b4d65b458d0d059241dd34c814f151c8bf6b89211209
 libraries:
   - id: google-cloud-pubsub
-    version: 2.33.0
+    version: 2.34.0
     last_generated_commit: 9fcfbea0aa5b50fa22e190faceb073d74504172b
     apis:
       - path: google/pubsub/v1
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ac71546a8..bcf798e60 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,13 @@
 
 [1]: https://pypi.org/project/google-cloud-pubsub/#history
 
+## [2.34.0](https://github.com/googleapis/python-pubsub/compare/v2.33.0...v2.34.0) (2025-12-16)
+
+
+### Features
+
+* support mTLS certificates when available (#1566) ([24761a2fedeb17f5af98a72a62306ad59306a553](https://github.com/googleapis/python-pubsub/commit/24761a2fedeb17f5af98a72a62306ad59306a553))
+
 
 ## [2.33.0](https://github.com/googleapis/python-pubsub/compare/v2.32.0...v2.33.0) (2025-10-30)
 
diff --git a/google/pubsub/gapic_version.py b/google/pubsub/gapic_version.py
index 1eb64a9d6..b31b170e1 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__ = "2.33.0"  # {x-release-please-version}
+__version__ = "2.34.0"  # {x-release-please-version}
diff --git a/google/pubsub_v1/gapic_version.py b/google/pubsub_v1/gapic_version.py
index 1eb64a9d6..b31b170e1 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__ = "2.33.0"  # {x-release-please-version}
+__version__ = "2.34.0"  # {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 bcad2272f..f3af602ab 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": "2.33.0"
+    "version": "2.34.0"
   },
   "snippets": [
     {