diff --git a/.github/.OwlBot.lock.yaml b/.github/.OwlBot.lock.yaml
index 2aefd0e91..51213ca00 100644
--- a/.github/.OwlBot.lock.yaml
+++ b/.github/.OwlBot.lock.yaml
@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:97b671488ad548ef783a452a9e1276ac10f144d5ae56d98cc4bf77ba504082b4
-# created: 2024-02-06T03:20:16.660474034Z
+  digest: sha256:a0c4463fcfd9893fc172a3b3db2b6ac0c7b94ec6ad458c7dcea12d9693615ac3
+# created: 2024-02-17T12:21:23.177926195Z
diff --git a/.kokoro/requirements.txt b/.kokoro/requirements.txt
index 8c11c9f3e..f80bdcd62 100644
--- a/.kokoro/requirements.txt
+++ b/.kokoro/requirements.txt
@@ -93,39 +93,39 @@ colorlog==6.7.0 \
     # via
     #   gcp-docuploader
     #   nox
-cryptography==42.0.0 \
-    --hash=sha256:0a68bfcf57a6887818307600c3c0ebc3f62fbb6ccad2240aa21887cda1f8df1b \
-    --hash=sha256:146e971e92a6dd042214b537a726c9750496128453146ab0ee8971a0299dc9bd \
-    --hash=sha256:14e4b909373bc5bf1095311fa0f7fcabf2d1a160ca13f1e9e467be1ac4cbdf94 \
-    --hash=sha256:206aaf42e031b93f86ad60f9f5d9da1b09164f25488238ac1dc488334eb5e221 \
-    --hash=sha256:3005166a39b70c8b94455fdbe78d87a444da31ff70de3331cdec2c568cf25b7e \
-    --hash=sha256:324721d93b998cb7367f1e6897370644751e5580ff9b370c0a50dc60a2003513 \
-    --hash=sha256:33588310b5c886dfb87dba5f013b8d27df7ffd31dc753775342a1e5ab139e59d \
-    --hash=sha256:35cf6ed4c38f054478a9df14f03c1169bb14bd98f0b1705751079b25e1cb58bc \
-    --hash=sha256:3ca482ea80626048975360c8e62be3ceb0f11803180b73163acd24bf014133a0 \
-    --hash=sha256:56ce0c106d5c3fec1038c3cca3d55ac320a5be1b44bf15116732d0bc716979a2 \
-    --hash=sha256:5a217bca51f3b91971400890905a9323ad805838ca3fa1e202a01844f485ee87 \
-    --hash=sha256:678cfa0d1e72ef41d48993a7be75a76b0725d29b820ff3cfd606a5b2b33fda01 \
-    --hash=sha256:69fd009a325cad6fbfd5b04c711a4da563c6c4854fc4c9544bff3088387c77c0 \
-    --hash=sha256:6cf9b76d6e93c62114bd19485e5cb003115c134cf9ce91f8ac924c44f8c8c3f4 \
-    --hash=sha256:74f18a4c8ca04134d2052a140322002fef535c99cdbc2a6afc18a8024d5c9d5b \
-    --hash=sha256:85f759ed59ffd1d0baad296e72780aa62ff8a71f94dc1ab340386a1207d0ea81 \
-    --hash=sha256:87086eae86a700307b544625e3ba11cc600c3c0ef8ab97b0fda0705d6db3d4e3 \
-    --hash=sha256:8814722cffcfd1fbd91edd9f3451b88a8f26a5fd41b28c1c9193949d1c689dc4 \
-    --hash=sha256:8fedec73d590fd30c4e3f0d0f4bc961aeca8390c72f3eaa1a0874d180e868ddf \
-    --hash=sha256:9515ea7f596c8092fdc9902627e51b23a75daa2c7815ed5aa8cf4f07469212ec \
-    --hash=sha256:988b738f56c665366b1e4bfd9045c3efae89ee366ca3839cd5af53eaa1401bce \
-    --hash=sha256:a2a8d873667e4fd2f34aedab02ba500b824692c6542e017075a2efc38f60a4c0 \
-    --hash=sha256:bd7cf7a8d9f34cc67220f1195884151426ce616fdc8285df9054bfa10135925f \
-    --hash=sha256:bdce70e562c69bb089523e75ef1d9625b7417c6297a76ac27b1b8b1eb51b7d0f \
-    --hash=sha256:be14b31eb3a293fc6e6aa2807c8a3224c71426f7c4e3639ccf1a2f3ffd6df8c3 \
-    --hash=sha256:be41b0c7366e5549265adf2145135dca107718fa44b6e418dc7499cfff6b4689 \
-    --hash=sha256:c310767268d88803b653fffe6d6f2f17bb9d49ffceb8d70aed50ad45ea49ab08 \
-    --hash=sha256:c58115384bdcfe9c7f644c72f10f6f42bed7cf59f7b52fe1bf7ae0a622b3a139 \
-    --hash=sha256:c640b0ef54138fde761ec99a6c7dc4ce05e80420262c20fa239e694ca371d434 \
-    --hash=sha256:ca20550bb590db16223eb9ccc5852335b48b8f597e2f6f0878bbfd9e7314eb17 \
-    --hash=sha256:d97aae66b7de41cdf5b12087b5509e4e9805ed6f562406dfcf60e8481a9a28f8 \
-    --hash=sha256:e9326ca78111e4c645f7e49cbce4ed2f3f85e17b61a563328c85a5208cf34440
+cryptography==42.0.2 \
+    --hash=sha256:087887e55e0b9c8724cf05361357875adb5c20dec27e5816b653492980d20380 \
+    --hash=sha256:09a77e5b2e8ca732a19a90c5bca2d124621a1edb5438c5daa2d2738bfeb02589 \
+    --hash=sha256:130c0f77022b2b9c99d8cebcdd834d81705f61c68e91ddd614ce74c657f8b3ea \
+    --hash=sha256:141e2aa5ba100d3788c0ad7919b288f89d1fe015878b9659b307c9ef867d3a65 \
+    --hash=sha256:28cb2c41f131a5758d6ba6a0504150d644054fd9f3203a1e8e8d7ac3aea7f73a \
+    --hash=sha256:2f9f14185962e6a04ab32d1abe34eae8a9001569ee4edb64d2304bf0d65c53f3 \
+    --hash=sha256:320948ab49883557a256eab46149df79435a22d2fefd6a66fe6946f1b9d9d008 \
+    --hash=sha256:36d4b7c4be6411f58f60d9ce555a73df8406d484ba12a63549c88bd64f7967f1 \
+    --hash=sha256:3b15c678f27d66d247132cbf13df2f75255627bcc9b6a570f7d2fd08e8c081d2 \
+    --hash=sha256:3dbd37e14ce795b4af61b89b037d4bc157f2cb23e676fa16932185a04dfbf635 \
+    --hash=sha256:4383b47f45b14459cab66048d384614019965ba6c1a1a141f11b5a551cace1b2 \
+    --hash=sha256:44c95c0e96b3cb628e8452ec060413a49002a247b2b9938989e23a2c8291fc90 \
+    --hash=sha256:4b063d3413f853e056161eb0c7724822a9740ad3caa24b8424d776cebf98e7ee \
+    --hash=sha256:52ed9ebf8ac602385126c9a2fe951db36f2cb0c2538d22971487f89d0de4065a \
+    --hash=sha256:55d1580e2d7e17f45d19d3b12098e352f3a37fe86d380bf45846ef257054b242 \
+    --hash=sha256:5ef9bc3d046ce83c4bbf4c25e1e0547b9c441c01d30922d812e887dc5f125c12 \
+    --hash=sha256:5fa82a26f92871eca593b53359c12ad7949772462f887c35edaf36f87953c0e2 \
+    --hash=sha256:61321672b3ac7aade25c40449ccedbc6db72c7f5f0fdf34def5e2f8b51ca530d \
+    --hash=sha256:701171f825dcab90969596ce2af253143b93b08f1a716d4b2a9d2db5084ef7be \
+    --hash=sha256:841ec8af7a8491ac76ec5a9522226e287187a3107e12b7d686ad354bb78facee \
+    --hash=sha256:8a06641fb07d4e8f6c7dda4fc3f8871d327803ab6542e33831c7ccfdcb4d0ad6 \
+    --hash=sha256:8e88bb9eafbf6a4014d55fb222e7360eef53e613215085e65a13290577394529 \
+    --hash=sha256:a00aee5d1b6c20620161984f8ab2ab69134466c51f58c052c11b076715e72929 \
+    --hash=sha256:a047682d324ba56e61b7ea7c7299d51e61fd3bca7dad2ccc39b72bd0118d60a1 \
+    --hash=sha256:a7ef8dd0bf2e1d0a27042b231a3baac6883cdd5557036f5e8df7139255feaac6 \
+    --hash=sha256:ad28cff53f60d99a928dfcf1e861e0b2ceb2bc1f08a074fdd601b314e1cc9e0a \
+    --hash=sha256:b9097a208875fc7bbeb1286d0125d90bdfed961f61f214d3f5be62cd4ed8a446 \
+    --hash=sha256:b97fe7d7991c25e6a31e5d5e795986b18fbbb3107b873d5f3ae6dc9a103278e9 \
+    --hash=sha256:e0ec52ba3c7f1b7d813cd52649a5b3ef1fc0d433219dc8c93827c57eab6cf888 \
+    --hash=sha256:ea2c3ffb662fec8bbbfce5602e2c159ff097a4631d96235fcf0fb00e59e3ece4 \
+    --hash=sha256:fa3dec4ba8fb6e662770b74f62f1a0c7d4e37e25b58b2bf2c1be4c95372b4a33 \
+    --hash=sha256:fbeb725c9dc799a574518109336acccaf1303c30d45c075c665c0793c2f79a7f
     # via
     #   gcp-releasetool
     #   secretstorage
diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 318c38f78..ba120c9f5 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,4 +1,4 @@
 {
-    ".": "2.19.4"
+    ".": "2.19.5"
 }
   
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d2a7c2051..ab1f26d73 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,13 @@
 [1]: https://pypi.org/project/google-cloud-pubsub/#history
 
 
+## [2.19.5](https://github.com/googleapis/python-pubsub/compare/v2.19.4...v2.19.5) (2024-02-22)
+
+
+### Bug Fixes
+
+* Update system_test_python_versions ([#1096](https://github.com/googleapis/python-pubsub/issues/1096)) ([c659ac7](https://github.com/googleapis/python-pubsub/commit/c659ac777f177e54d7272a8de93fa9f554b15d46))
+
 ## [2.19.4](https://github.com/googleapis/python-pubsub/compare/v2.19.3...v2.19.4) (2024-02-09)
 
 
diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index 03a700296..727b5ec7f 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -143,12 +143,12 @@ Running System Tests
    $ nox -s system
 
    # Run a single system test
-   $ nox -s system-3.10 -- -k <name of test>
+   $ nox -s system-3.12 -- -k <name of test>
 
 
   .. note::
 
-      System tests are only configured to run under Python 3.10.
+      System tests are only configured to run under Python 3.12.
       For expediency, we do not run them in older versions of Python 3.
 
   This alone will not run the tests. You'll need to change some local
diff --git a/google/pubsub/gapic_version.py b/google/pubsub/gapic_version.py
index 34f81704a..3aa3b013a 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__ = "2.19.4"  # {x-release-please-version}
+__version__ = "2.19.5"  # {x-release-please-version}
diff --git a/google/pubsub_v1/gapic_version.py b/google/pubsub_v1/gapic_version.py
index 34f81704a..3aa3b013a 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__ = "2.19.4"  # {x-release-please-version}
+__version__ = "2.19.5"  # {x-release-please-version}
diff --git a/noxfile.py b/noxfile.py
index ec63afcb4..ae87830ec 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -50,7 +50,7 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.10"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.12"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES: List[str] = [
     "mock",
     "pytest",
diff --git a/owlbot.py b/owlbot.py
index c156909ff..ad76a48ee 100644
--- a/owlbot.py
+++ b/owlbot.py
@@ -337,7 +337,7 @@
     cov_level=100,
     versions=gcp.common.detect_versions(path="./google", default_first=True),
     unit_test_python_versions=["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"],
-    system_test_python_versions=["3.10"],
+    system_test_python_versions=["3.12"],
     system_test_external_dependencies=["psutil","flaky"],
 )
 s.move(templated_files, excludes=[".coveragerc", ".github/release-please.yml", "README.rst", "docs/index.rst"])
diff --git a/pytest.ini b/pytest.ini
index 7308b0871..ce16e4730 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -11,4 +11,6 @@ filterwarnings =
     # Remove warning once https://github.com/googleapis/gapic-generator-python/issues/1938 is fixed
     ignore:The return_immediately flag is deprecated and should be set to False.:DeprecationWarning
     # Remove warning once https://github.com/googleapis/gapic-generator-python/issues/1939 is fixed
-    ignore:get_mtls_endpoint_and_cert_source is deprecated.:DeprecationWarning
\ No newline at end of file
+    ignore:get_mtls_endpoint_and_cert_source is deprecated.:DeprecationWarning
+    # Remove warning once https://github.com/grpc/grpc/issues/35974 is fixed
+    ignore:unclosed:ResourceWarning
\ No newline at end of file
diff --git a/samples/generated_samples/snippet_metadata_google.pubsub.v1.json b/samples/generated_samples/snippet_metadata_google.pubsub.v1.json
index 6cbf881c8..78988e6a1 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": "2.19.4"
+    "version": "2.19.5"
   },
   "snippets": [
     {