diff --git a/libs/langgraph/tests/test_pregel.py b/libs/langgraph/tests/test_pregel.py
index 7357a0f43..0e77b65c9 100644
--- a/libs/langgraph/tests/test_pregel.py
+++ b/libs/langgraph/tests/test_pregel.py
@@ -11634,7 +11634,7 @@ def test_debug_subgraphs():
 
     assert len(checkpoint_events) == len(checkpoint_history)
 
-    def normalize_config(config: dict | None) -> dict | None:
+    def normalize_config(config: Optional[dict]) -> Optional[dict]:
         if config is None:
             return None
         return config["configurable"]
diff --git a/libs/langgraph/tests/test_pregel_async.py b/libs/langgraph/tests/test_pregel_async.py
index 63a2f75f7..92b1ebf9a 100644
--- a/libs/langgraph/tests/test_pregel_async.py
+++ b/libs/langgraph/tests/test_pregel_async.py
@@ -9871,7 +9871,7 @@ async def test_debug_subgraphs():
 
     assert len(checkpoint_events) == len(checkpoint_history)
 
-    def normalize_config(config: Optional[dict, None]) -> Optional[dict, None]:
+    def normalize_config(config: Optional[dict]) -> Optional[dict]:
         if config is None:
             return None
         return config["configurable"]