diff --git a/libs/langgraph/tests/test_pregel.py b/libs/langgraph/tests/test_pregel.py
index 7702d79e2..157a02cc7 100644
--- a/libs/langgraph/tests/test_pregel.py
+++ b/libs/langgraph/tests/test_pregel.py
@@ -8564,7 +8564,7 @@ def test_subgraph_resume_reexecutes_from_valid_checkpoint(
 
     outer_model_calls = 0
 
-    def outer_model(state: OuterState) -> Command | None:
+    def outer_model(state: OuterState) -> Optional[Command]:
         nonlocal outer_model_calls
         outer_model_calls += 1
         if "output" in state:
diff --git a/libs/langgraph/tests/test_pregel_async.py b/libs/langgraph/tests/test_pregel_async.py
index b560a82eb..1bd8fa143 100644
--- a/libs/langgraph/tests/test_pregel_async.py
+++ b/libs/langgraph/tests/test_pregel_async.py
@@ -9259,7 +9259,7 @@ async def test_subgraph_resume_reexecutes_from_valid_checkpoint(
 
     outer_model_calls = 0
 
-    async def outer_model(state: OuterState) -> Command | None:
+    async def outer_model(state: OuterState) -> Optional[Command]:
         nonlocal outer_model_calls
         outer_model_calls += 1
         if "output" in state: