diff --git a/synthtool/languages/python_mono_repo.py b/synthtool/languages/python_mono_repo.py
index e648238b8..b51412b64 100644
--- a/synthtool/languages/python_mono_repo.py
+++ b/synthtool/languages/python_mono_repo.py
@@ -160,7 +160,9 @@ def owlbot_main(package_dir: str) -> None:
             unit_test_python_versions=["3.7", "3.8", "3.9", "3.10", "3.11"],
             cov_level=100,
             versions=gcp.common.detect_versions(
-                path=f"{package_dir}/google", default_first=True
+                path=f"{package_dir}/google",
+                default_version=default_version,
+                default_first=True,
             ),
         )
         s.move([templated_files], package_dir)