diff --git a/lightrag/kg/json_kv_impl.py b/lightrag/kg/json_kv_impl.py
index 14565c86..ff184dbd 100644
--- a/lightrag/kg/json_kv_impl.py
+++ b/lightrag/kg/json_kv_impl.py
@@ -21,7 +21,7 @@ class JsonKVStorage(BaseKVStorage):
         self._data: dict[str, Any] = load_json(self._file_name) or {}
         self._lock = asyncio.Lock()
         logger.info(f"Load KV {self.namespace} with {len(self._data)} data")
-        
+
     async def index_done_callback(self):
         write_json(self._data, self._file_name)
 
@@ -46,4 +46,4 @@ class JsonKVStorage(BaseKVStorage):
         self._data.update(left_data)
 
     async def drop(self) -> None:
-        self._data = {}
\ No newline at end of file
+        self._data = {}
diff --git a/lightrag/kg/jsondocstatus_impl.py b/lightrag/kg/jsondocstatus_impl.py
index 603487bc..31aa836a 100644
--- a/lightrag/kg/jsondocstatus_impl.py
+++ b/lightrag/kg/jsondocstatus_impl.py
@@ -50,7 +50,7 @@ Usage:
 
 import os
 from dataclasses import dataclass
-from typing import Any, Union, Dict
+from typing import Any, Union
 
 from lightrag.utils import (
     logger,
@@ -85,18 +85,18 @@ class JsonDocStatusStorage(DocStatusStorage):
             ]
         )
 
-    async def get_status_counts(self) -> Dict[str, int]:
+    async def get_status_counts(self) -> dict[str, int]:
         """Get counts of documents in each status"""
         counts = {status: 0 for status in DocStatus}
         for doc in self._data.values():
             counts[doc["status"]] += 1
         return counts
 
-    async def get_failed_docs(self) -> Dict[str, DocProcessingStatus]:
+    async def get_failed_docs(self) -> dict[str, DocProcessingStatus]:
         """Get all failed documents"""
         return {k: v for k, v in self._data.items() if v["status"] == DocStatus.FAILED}
 
-    async def get_pending_docs(self) -> Dict[str, DocProcessingStatus]:
+    async def get_pending_docs(self) -> dict[str, DocProcessingStatus]:
         """Get all pending documents"""
         return {k: v for k, v in self._data.items() if v["status"] == DocStatus.PENDING}
 
diff --git a/lightrag/kg/mongo_impl.py b/lightrag/kg/mongo_impl.py
index 45d4bb07..35902d37 100644
--- a/lightrag/kg/mongo_impl.py
+++ b/lightrag/kg/mongo_impl.py
@@ -74,6 +74,7 @@ class MongoKVStorage(BaseKVStorage):
         """Drop the collection"""
         await self._data.drop()
 
+
 @dataclass
 class MongoGraphStorage(BaseGraphStorage):
     """
diff --git a/lightrag/kg/redis_impl.py b/lightrag/kg/redis_impl.py
index 025f293f..05da41b7 100644
--- a/lightrag/kg/redis_impl.py
+++ b/lightrag/kg/redis_impl.py
@@ -20,7 +20,7 @@ class RedisKVStorage(BaseKVStorage):
         redis_url = os.environ.get("REDIS_URI", "redis://localhost:6379")
         self._redis = Redis.from_url(redis_url, decode_responses=True)
         logger.info(f"Use Redis as KV {self.namespace}")
-        
+
     async def get_by_id(self, id):
         data = await self._redis.get(f"{self.namespace}:{id}")
         return json.loads(data) if data else None
@@ -53,4 +53,4 @@ class RedisKVStorage(BaseKVStorage):
     async def drop(self) -> None:
         keys = await self._redis.keys(f"{self.namespace}:*")
         if keys:
-            await self._redis.delete(*keys)
\ No newline at end of file
+            await self._redis.delete(*keys)