diff --git a/noxfile.py b/noxfile.py
index c7c3074bc7..f32c24f1e3 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -32,7 +32,7 @@
 ISORT_VERSION = "isort==5.11.0"
 LINT_PATHS = ["docs", "google", "tests", "noxfile.py", "setup.py"]
 
-DEFAULT_PYTHON_VERSION = "3.12"
+DEFAULT_PYTHON_VERSION = "3.8"
 
 DEFAULT_MOCK_SERVER_TESTS_PYTHON_VERSION = "3.12"
 UNIT_TEST_PYTHON_VERSIONS: List[str] = [