diff --git a/libs/langchain/langchain/callbacks/tracers/log_stream.py b/libs/langchain/langchain/callbacks/tracers/log_stream.py
index c4978f88bf..08e1eedddb 100644
--- a/libs/langchain/langchain/callbacks/tracers/log_stream.py
+++ b/libs/langchain/langchain/callbacks/tracers/log_stream.py
@@ -193,7 +193,7 @@ class LogStreamCallbackHandler(BaseTracer):
                         "op": "replace",
                         "path": "",
                         "value": RunState(
-                            id=run.id,
+                            id=str(run.id),
                             streamed_output=[],
                             final_output=None,
                             logs=[],
diff --git a/libs/langchain/tests/unit_tests/schema/runnable/test_runnable.py b/libs/langchain/tests/unit_tests/schema/runnable/test_runnable.py
index 28f0045a2d..5507e63d35 100644
--- a/libs/langchain/tests/unit_tests/schema/runnable/test_runnable.py
+++ b/libs/langchain/tests/unit_tests/schema/runnable/test_runnable.py
@@ -379,7 +379,7 @@ async def test_prompt() -> None:
     assert stream_log[0].ops[0]["value"]["logs"] == []
     assert stream_log[0].ops[0]["value"]["final_output"] is None
     assert stream_log[0].ops[0]["value"]["streamed_output"] == []
-    assert type(stream_log[0].ops[0]["value"]["id"]) == UUID
+    assert type(stream_log[0].ops[0]["value"]["id"]) == str
 
     assert stream_log[1:] == [
         RunLogPatch(
@@ -1414,7 +1414,7 @@ async def test_map_astream() -> None:
 
     assert final_state.state["final_output"] == final_value
     assert len(final_state.state["streamed_output"]) == len(streamed_chunks)
-    assert isinstance(final_state.state["id"], UUID)
+    assert type(final_state.state["id"]) == str
     assert len(final_state.ops) == len(streamed_ops)
     assert len(final_state.state["logs"]) == 5
     assert final_state.state["logs"][0]["name"] == "ChatPromptTemplate"