diff --git a/langgraph/pregel/io.py b/langgraph/pregel/io.py
index b844b1e55..4dfc7b967 100644
--- a/langgraph/pregel/io.py
+++ b/langgraph/pregel/io.py
@@ -27,7 +27,7 @@ def map_output(
     output_channels: Union[str, Sequence[str]],
     pending_writes: Sequence[tuple[str, Any]],
     channels: Mapping[str, BaseChannel],
-) -> dict[str, Any] | Any | None:
+) -> Optional[Union[dict[str, Any], Any]]:
     """Map pending writes (a sequence of tuples (channel, value)) to output chunk."""
     if isinstance(output_channels, str):
         if any(chan == output_channels for chan, _ in pending_writes):
diff --git a/pyproject.toml b/pyproject.toml
index 3ff1de7e0..e115456e2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "langgraph"
-version = "0.0.8"
+version = "0.0.9"
 description = "langgraph"
 authors = []
 license = "LangGraph License"