diff --git a/lightrag/kg/json_kv_impl.py b/lightrag/kg/json_kv_impl.py
index 779c52a9..658e1239 100644
--- a/lightrag/kg/json_kv_impl.py
+++ b/lightrag/kg/json_kv_impl.py
@@ -1,7 +1,7 @@
 import asyncio
 import os
 from dataclasses import dataclass
-from typing import Any
+from typing import Any, final
 
 from lightrag.base import (
     BaseKVStorage,
@@ -13,6 +13,7 @@ from lightrag.utils import (
 )
 
 
+@final
 @dataclass
 class JsonKVStorage(BaseKVStorage):
     def __post_init__(self):