diff --git a/dev/microsoft-agents-testing/tests/core/test_integration.py b/dev/microsoft-agents-testing/tests/core/test_integration.py
index 7efd29bf..7c2f5f1b 100644
--- a/dev/microsoft-agents-testing/tests/core/test_integration.py
+++ b/dev/microsoft-agents-testing/tests/core/test_integration.py
@@ -139,8 +139,8 @@ async def _handle_messages(self, request: Request) -> Response:
                 text=json.dumps({"id": "msg-1"}),
             )
 
-        except Exception as e:
-            return Response(status=500, text=str(e))
+        except Exception:
+            return Response(status=500, text="Internal server error")
 
     def _get_responses(self, activity: Activity) -> list[dict]:
         """Get configured responses for an activity."""