diff --git a/synthtool/gcp/templates/python_library/docs/conf.py.j2 b/synthtool/gcp/templates/python_library/docs/conf.py.j2
index b46ed80f8..34634c154 100644
--- a/synthtool/gcp/templates/python_library/docs/conf.py.j2
+++ b/synthtool/gcp/templates/python_library/docs/conf.py.j2
@@ -43,7 +43,7 @@ extensions = [
 
 # autodoc/autosummary flags
 autoclass_content = "both"
-autodoc_default_flags = ["members"]
+autodoc_default_options = {"members": True}
 autosummary_generate = True