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/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