diff --git a/libs/langgraph/langgraph/types.py b/libs/langgraph/langgraph/types.py
index 53dc6bd57..5f2394bc6 100644
--- a/libs/langgraph/langgraph/types.py
+++ b/libs/langgraph/langgraph/types.py
@@ -19,6 +19,8 @@
     cast,
 )
 
+from pydantic import BaseModel
+
 from langchain_core.runnables import Runnable, RunnableConfig
 from typing_extensions import Self
 
@@ -287,6 +289,8 @@ def __repr__(self) -> str:
     def _update_as_tuples(self) -> Sequence[tuple[str, Any]]:
         if isinstance(self.update, dict):
             return list(self.update.items())
+        elif isinstance(self.update, BaseModel):
+            return list(self.update.model_dump().items())
         elif isinstance(self.update, (list, tuple)) and all(
             isinstance(t, tuple) and len(t) == 2 and isinstance(t[0], str)
             for t in self.update