diff --git a/app/api/endpoints/wecom.py b/app/api/endpoints/wecom.py
index a06a116..fbfca60 100644
--- a/app/api/endpoints/wecom.py
+++ b/app/api/endpoints/wecom.py
@@ -126,7 +126,7 @@ async def wechat_corp_callback(
             if event == 'change_external_chat':
                 chat_id = msg_root.find('ChatId').text
                 change_type = msg_root.find('ChangeType').text
-                update_detail = msg_root.find('UpdateDetail')
+                update_detail = msg_root.find('UpdateDetail').text
 
                 print(f"chat_id: {chat_id}")
                 print(f"change_type: {change_type}")