diff --git a/.github/workflows/test_python.yml b/.github/workflows/test_python.yml
index 5ede687f3e..bbaeb7a1a7 100644
--- a/.github/workflows/test_python.yml
+++ b/.github/workflows/test_python.yml
@@ -115,5 +115,5 @@ jobs:
           bazel: >-
             test ${{ matrix.targets }} ${{ matrix.flags }}
             --test_env=KOKORO_PYTHON_VERSION=${{ matrix.version }}
-            --macos_minimum_os=10.9
+            --macos_minimum_os=10.15
           exclude-targets: -//python/pb_unit_tests/...