diff --git a/tests/unit/cfngin/hooks/test_aws_lambda.py b/tests/unit/cfngin/hooks/test_aws_lambda.py
index d696efc9c..c686f5400 100644
--- a/tests/unit/cfngin/hooks/test_aws_lambda.py
+++ b/tests/unit/cfngin/hooks/test_aws_lambda.py
@@ -655,7 +655,7 @@ def test_with_docker_image(self) -> None:
     def test_with_runtime(self) -> None:
         """Test with runtime provided."""
         client = make_fake_client()
-        runtime = "python3.9"
+        runtime = "python3.8"
         dockerized_pip(os.getcwd(), client=client, runtime=runtime)
 
         client.api.create_container.assert_called_with(