langgraph-checkpoint 4.0.3 calls Reviver() at module load without allowed_objects, printing a pending-deprecation warning at every CLI start. The upstream patch is merged (langchain-ai/langgraph#7743) but not released; no app-side seam fixes it. Install a surgical filter in package init (message regex + PendingDeprecationWarning category). Remove when we bump past langgraph-checkpoint 4.0.3.