diff --git a/aiogram/contrib/middlewares/fsm.py b/aiogram/contrib/middlewares/fsm.py
index e3550a34..d198417f 100644
--- a/aiogram/contrib/middlewares/fsm.py
+++ b/aiogram/contrib/middlewares/fsm.py
@@ -1,5 +1,4 @@
 import copy
-import weakref
 
 from aiogram.dispatcher.middlewares import LifetimeControllerMiddleware
 from aiogram.dispatcher.storage import FSMContext
@@ -8,10 +7,6 @@ from aiogram.dispatcher.storage import FSMContext
 class FSMMiddleware(LifetimeControllerMiddleware):
     skip_patterns = ['error', 'update']
 
-    def __init__(self):
-        super(FSMMiddleware, self).__init__()
-        self._proxies = weakref.WeakKeyDictionary()
-
     async def pre_process(self, obj, data, *args):
         proxy = await FSMSStorageProxy.create(self.manager.dispatcher.current_state())
         data['state_data'] = proxy