diff --git a/workers/python/activities.py b/workers/python/activities.py
index 12464c1..8a30e10 100644
--- a/workers/python/activities.py
+++ b/workers/python/activities.py
@@ -19,8 +19,8 @@ class TestActivities:
     """
     测试活动类，包含API测试和UI测试的Temporal Activity实现
     """
-    
-    async def _heartbeat_task(self, interval_seconds=30):
+    @staticmethod
+    async def _heartbeat_task(interval_seconds=30):
         """
         心跳任务，定期发送心跳信号，防止长时间运行的Activity被Temporal服务器认为已死亡