diff --git a/src/chongming_stream_manager/__init__.py b/src/chongming_stream_manager/__init__.py
index 951843a..c9f48a5 100644
--- a/src/chongming_stream_manager/__init__.py
+++ b/src/chongming_stream_manager/__init__.py
@@ -1,8 +1,8 @@
 import asyncio
-from typing import Dict, Optional
+from typing import Dict
 import logging
-import os
 import subprocess
+import re
 
 logger = logging.getLogger(__name__)