diff --git a/libs/langchain/tests/unit_tests/chat_models/test_base.py b/libs/langchain/tests/unit_tests/chat_models/test_base.py
index c06e8440731..853a0d29488 100644
--- a/libs/langchain/tests/unit_tests/chat_models/test_base.py
+++ b/libs/langchain/tests/unit_tests/chat_models/test_base.py
@@ -116,6 +116,7 @@ def test_configurable() -> None:
             "request_timeout": None,
             "max_retries": 2,
             "presence_penalty": None,
+            "reasoning_effort": None,
             "frequency_penalty": None,
             "seed": None,
             "logprobs": None,