diff --git a/libs/langchain/langchain/chains/rl_chain/base.py b/libs/langchain/langchain/chains/rl_chain/base.py
index c250815943..d08200c709 100644
--- a/libs/langchain/langchain/chains/rl_chain/base.py
+++ b/libs/langchain/langchain/chains/rl_chain/base.py
@@ -402,7 +402,7 @@ class RLChain(Chain, Generic[TEvent]):
         return [self.output_key]
 
     def update_with_delayed_score(
-        self, score: float, event: TEvent, force_score: bool = False
+        self, score: float, chain_response: Dict[str, Any], force_score: bool = False
     ) -> None:
         """
         Updates the learned policy with the score provided.
@@ -415,6 +415,7 @@ class RLChain(Chain, Generic[TEvent]):
             )
         if self.metrics:
             self.metrics.on_feedback(score)
+        event: TEvent = chain_response["selection_metadata"]
         self._call_after_scoring_before_learning(event=event, score=score)
         self.active_policy.learn(event=event)
         self.active_policy.log(event=event)
diff --git a/libs/langchain/tests/unit_tests/chains/rl_chain/test_pick_best_chain_call.py b/libs/langchain/tests/unit_tests/chains/rl_chain/test_pick_best_chain_call.py
index d7dee7fdf6..d4576ce254 100644
--- a/libs/langchain/tests/unit_tests/chains/rl_chain/test_pick_best_chain_call.py
+++ b/libs/langchain/tests/unit_tests/chains/rl_chain/test_pick_best_chain_call.py
@@ -86,7 +86,7 @@ def test_update_with_delayed_score_with_auto_validator_throws() -> None:
     selection_metadata = response["selection_metadata"]
     assert selection_metadata.selected.score == 3.0
     with pytest.raises(RuntimeError):
-        chain.update_with_delayed_score(event=selection_metadata, score=100)
+        chain.update_with_delayed_score(chain_response=response, score=100)
 
 
 @pytest.mark.requires("vowpal_wabbit_next", "sentence_transformers")
@@ -109,7 +109,7 @@ def test_update_with_delayed_score_force() -> None:
     selection_metadata = response["selection_metadata"]
     assert selection_metadata.selected.score == 3.0
     chain.update_with_delayed_score(
-        event=selection_metadata, score=100, force_score=True
+        chain_response=response, score=100, force_score=True
     )
     assert selection_metadata.selected.score == 100.0
 
@@ -131,7 +131,7 @@ def test_update_with_delayed_score() -> None:
     assert response["response"] == "hey"
     selection_metadata = response["selection_metadata"]
     assert selection_metadata.selected.score is None
-    chain.update_with_delayed_score(event=selection_metadata, score=100)
+    chain.update_with_delayed_score(chain_response=response, score=100)
     assert selection_metadata.selected.score == 100.0