diff --git a/libs/langgraph/langgraph/pregel/_algo.py b/libs/langgraph/langgraph/pregel/_algo.py
index cddc0a8ca..d7157e239 100644
--- a/libs/langgraph/langgraph/pregel/_algo.py
+++ b/libs/langgraph/langgraph/pregel/_algo.py
@@ -210,7 +210,7 @@ def local_read(
     return values
 
 
-def increment(current: int | None, channel: None = None) -> int:
+def increment(current: int | None, channel: None) -> int:
     """Default channel versioning function, increments the current int version."""
     return current + 1 if current is not None else 1