diff --git a/stackone_ai/models.py b/stackone_ai/models.py
index 1e8b813..7a06589 100644
--- a/stackone_ai/models.py
+++ b/stackone_ai/models.py
@@ -437,9 +437,6 @@ class StackOneLangChainTool(BaseTool):
             def _run(self, **kwargs: Any) -> Any:
                 return parent_tool.execute(kwargs)
 
-            async def _arun(self, **kwargs: Any) -> Any:
-                return self._run(**kwargs)
-
         return StackOneLangChainTool()
 
     def set_account_id(self, account_id: str | None) -> None: