diff --git a/lightrag/operate.py b/lightrag/operate.py
index 43f20eca..f41ca5ff 100644
--- a/lightrag/operate.py
+++ b/lightrag/operate.py
@@ -4,7 +4,6 @@ from functools import partial
 import asyncio
 import json
 import re
-import os
 import json_repair
 from typing import Any, AsyncIterator
 from collections import Counter, defaultdict