diff --git a/lightrag/lightrag.py b/lightrag/lightrag.py
index 22c32770..f2d48444 100644
--- a/lightrag/lightrag.py
+++ b/lightrag/lightrag.py
@@ -6,7 +6,7 @@ import configparser
 from dataclasses import asdict, dataclass, field
 from datetime import datetime
 from functools import partial
-from typing import Any, AsyncIterator, Callable, Iterator, cast
+from typing import Any, AsyncIterator, Callable, Iterator, cast, final
 
 from .base import (
     BaseGraphStorage,
@@ -225,7 +225,7 @@ def always_get_an_event_loop() -> asyncio.AbstractEventLoop:
         asyncio.set_event_loop(new_loop)
         return new_loop
 
-
+@final
 @dataclass
 class LightRAG:
     """LightRAG: Simple and Fast Retrieval-Augmented Generation."""