diff --git a/none/__init__.py b/none/__init__.py
index 1d31de04..53052b80 100644
--- a/none/__init__.py
+++ b/none/__init__.py
@@ -1,16 +1,16 @@
-import os
+import asyncio
 import importlib
 import logging
+import os
 import re
-import asyncio
 from typing import Any
 
 from aiocqhttp import CQHttp
 from aiocqhttp.message import Message
 
+from .log import logger
 from .message import handle_message
 from .notice_request import handle_notice_or_request
-from .log import logger
 
 
 def create_bot(config_object: Any = None) -> CQHttp:
diff --git a/none/command.py b/none/command.py
index 0b68040c..1a8eab74 100644
--- a/none/command.py
+++ b/none/command.py
@@ -1,5 +1,5 @@
-import re
 import asyncio
+import re
 from datetime import datetime
 from typing import (
     Tuple, Union, Callable, Iterable, Dict, Any, Optional, Sequence
@@ -9,8 +9,8 @@ from aiocqhttp import CQHttp
 from aiocqhttp.message import Message
 
 from . import permission as perm
-from .helpers import context_id
 from .expression import render
+from .helpers import context_id
 from .session import BaseSession
 
 # Key: str (one segment of command name)
@@ -27,7 +27,8 @@ _sessions = {}
 
 
 class Command:
-    __slots__ = ('name', 'func', 'permission', 'only_to_me', 'args_parser_func')
+    __slots__ = (
+    'name', 'func', 'permission', 'only_to_me', 'args_parser_func')
 
     def __init__(self, *, name: Tuple[str], func: Callable, permission: int,
                  only_to_me: bool):
diff --git a/none/log.py b/none/log.py
index 5842aeb0..6aab710b 100644
--- a/none/log.py
+++ b/none/log.py
@@ -1,5 +1,5 @@
-import sys
 import logging
+import sys
 
 logger = logging.getLogger('none')
 default_handler = logging.StreamHandler(sys.stdout)
diff --git a/none/message.py b/none/message.py
index 0dbc65f5..a712176e 100644
--- a/none/message.py
+++ b/none/message.py
@@ -4,8 +4,8 @@ from aiocqhttp import CQHttp
 from aiocqhttp.message import MessageSegment
 
 from .command import handle_command
-from .natural_language import handle_natural_language
 from .log import logger
+from .natural_language import handle_natural_language
 
 
 async def handle_message(bot: CQHttp, ctx: Dict[str, Any]) -> None:
diff --git a/none/natural_language.py b/none/natural_language.py
index b5b5ba71..7fe36827 100644
--- a/none/natural_language.py
+++ b/none/natural_language.py
@@ -1,5 +1,5 @@
-import re
 import asyncio
+import re
 from collections import namedtuple
 from typing import Dict, Any, Iterable, Optional, Callable, Union
 
@@ -7,9 +7,9 @@ from aiocqhttp import CQHttp
 from aiocqhttp.message import Message
 
 from . import permission as perm
-from .session import BaseSession
 from .command import call_command
 from .log import logger
+from .session import BaseSession
 
 _nl_processors = set()
 
diff --git a/none/notice_request.py b/none/notice_request.py
index ca9a9049..45eabab6 100644
--- a/none/notice_request.py
+++ b/none/notice_request.py
@@ -3,8 +3,8 @@ from typing import Dict, Any, Optional, Callable, Union
 from aiocqhttp import CQHttp, Error as CQHttpError
 from aiocqhttp.bus import EventBus
 
-from .session import BaseSession
 from .log import logger
+from .session import BaseSession
 
 _bus = EventBus()
 
diff --git a/none_demo/run.py b/none_demo/run.py
index 17f088c5..11c76d10 100644
--- a/none_demo/run.py
+++ b/none_demo/run.py
@@ -1,7 +1,6 @@
 from os import path
 
 import none
-
 from none_demo import config
 
 bot = none.create_bot(config)
diff --git a/setup.py b/setup.py
index 42f37faf..4328530a 100644
--- a/setup.py
+++ b/setup.py
@@ -14,7 +14,7 @@ setup(
     description='A QQ bot framework',
     long_description=long_description,
     long_description_content_type="text/markdown",
-    install_requires=['aiocqhttp>=0.3', 'aiocache'],
+    install_requires=['aiocqhttp>=0.4', 'aiocache'],
     python_requires='>=3.6',
     platforms='any',
     classifiers=(