diff --git a/aiogram/dispatcher/state.py b/aiogram/dispatcher/state.py
index a35f6998..a2f087a5 100644
--- a/aiogram/dispatcher/state.py
+++ b/aiogram/dispatcher/state.py
@@ -1,4 +1,6 @@
+import json
 import logging
+import os
 
 from .handler import SkipHandler
 
@@ -6,7 +8,6 @@ log = logging.getLogger('aiogram.StateMachine')
 
 
 # TODO: Provide async storage
-# TODO: Provide inline/callback and etc updates.
 
 
 class BaseStorage:
@@ -130,58 +131,17 @@ class BaseStorage:
         """
         raise NotImplementedError
 
-    def __setitem__(self, key, value):
-        """
-        Here you can use key or slice-key
-        
-        >>> storage[chat:user] = "new state"
-        or
-        >>> storage[chat] = "new state"
-        :param key: key or slice
-        :param value: new state
-        """
-        if isinstance(key, slice):
-            self.set_state(key.start, key.stop, value)
-        else:
-            self.set_state(key, key, value)
 
-    def __getitem__(self, key):
-        """
-        Here you can use key or slice-key
-        
-        >>> storage[chat:user]
-        or
-        >>> storage[chat]
-        :param key: key or slice
-        :return: state
-        """
-        if isinstance(key, slice):
-            return self.get_state(key.start, key.stop)
-        return self.get_state(key, key)
-
-    def __delitem__(self, key):
-        """
-        Reset state for user
-        :param key: 
-        :return: 
-        """
-        if isinstance(key, slice):
-            self.del_state(key.start, key.stop)
-        else:
-            self.del_state(key, key)
-
-    def __iter__(self):
-        yield from self.all_states()
-
-
-class StateStorage(BaseStorage):
+class MemoryStorage(BaseStorage):
     """
     Simple in-memory state storage
     Based on builtin dict
     """
 
-    def __init__(self):
-        self.storage = {}
+    def __init__(self, data=None):
+        if data is None:
+            data = {}
+        self.data = data
 
     def _prepare(self, chat, user):
         """
@@ -192,31 +152,42 @@ class StateStorage(BaseStorage):
         """
         result = False
 
-        if chat not in self.storage:
-            self.storage[chat] = {}
+        chat = str(chat)
+        user = str(user)
+
+        if chat not in self.data:
+            self.data[chat] = {}
             result = True
 
-        if user not in self.storage[chat]:
-            self.storage[chat][user] = {'state': None, 'data': {}}
+        if user not in self.data[chat]:
+            self.data[chat][user] = {'state': None, 'data': {}}
             result = True
 
         return result
 
     def set_state(self, chat, user, state):
+        chat = str(chat)
+        user = str(user)
+
         self._prepare(chat, user)
-        self.storage[chat][user]['state'] = self._prepare_state_name(state)
+        self.data[chat][user]['state'] = self._prepare_state_name(state)
 
     def get_state(self, chat, user):
+        chat = str(chat)
+        user = str(user)
+
         self._prepare(chat, user)
-        return self.storage[chat][user]['state']
+        return self.data[chat][user]['state']
 
     def del_state(self, chat, user):
+        chat = str(chat)
+        user = str(user)
+
         self._prepare(chat, user)
-        if self[chat:user] is not None:
-            self.storage[chat][user]['state'] = {'state': None, 'data': {}}
+        self.data[chat][user] = {'state': None, 'data': {}}
 
     def all_states(self, chat=None, user=None, state=None):
-        for chat_id, chat in self.storage.items():
+        for chat_id, chat in self.data.items():
             if chat is not None and chat != chat_id:
                 continue
             for user_id, user_state in chat.items():
@@ -227,24 +198,95 @@ class StateStorage(BaseStorage):
                 yield chat_id, user_id, user_state
 
     def set_value(self, chat, user, key, value):
+        chat = str(chat)
+        user = str(user)
+
         self._prepare(chat, user)
-        self.storage[chat][user]['data'][key] = value
+        self.data[chat][user]['data'][key] = value
 
     def del_value(self, chat, user, key):
+        chat = str(chat)
+        user = str(user)
+
         self._prepare(chat, user)
-        del self.storage[chat][user]['data'][key]
+        del self.data[chat][user]['data'][key]
 
     def get_data(self, chat, user):
+        chat = str(chat)
+        user = str(user)
+
         self._prepare(chat, user)
-        return self.storage[chat][user]['data']
+        return self.data[chat][user]['data']
 
     def update_data(self, chat, user, data):
+        chat = str(chat)
+        user = str(user)
+
         self._prepare(chat, user)
-        self.storage[chat][user]['data'].update(data)
+        self.data[chat][user]['data'].update(data)
 
     def clear_data(self, chat, user, key):
+        chat = str(chat)
+        user = str(user)
+
         self._prepare(chat, user)
-        self.storage[chat][user]['data'].clear()
+        self.data[chat][user]['data'].clear()
+
+
+class FileStorage(MemoryStorage):
+    """
+    File-like storage for states.
+    """
+
+    def __init__(self, filename):
+        self.filename = filename
+        super(FileStorage, self).__init__(self.load(filename))
+
+    @staticmethod
+    def load(filename):
+        """
+        Load data from file
+
+        :param filename: 
+        :return: dict
+        """
+        if os.path.isfile(filename):
+            with open(filename, 'r') as file:
+                return json.load(file)
+        return {}
+
+    def save(self):
+        """
+        Write states to file
+
+        :return: 
+        """
+        with open(self.filename, 'w') as file:
+            json.dump(self.data, file, indent=2)
+
+    def set_state(self, chat, user, state):
+        super(FileStorage, self).set_state(chat, user, state)
+        self.save()
+
+    def del_state(self, chat, user):
+        super(FileStorage, self).del_state(chat, user)
+        self.save()
+
+    def set_value(self, chat, user, key, value):
+        super(FileStorage, self).set_value(chat, user, key, value)
+        self.save()
+
+    def del_value(self, chat, user, key):
+        super(FileStorage, self).del_value(chat, user, key)
+        self.save()
+
+    def update_data(self, chat, user, data):
+        super(FileStorage, self).update_data(chat, user, data)
+        self.save()
+
+    def clear_data(self, chat, user, key):
+        super(FileStorage, self).clear_data(chat, user, key)
+        self.save()
 
 
 class Controller:
@@ -267,7 +309,7 @@ class Controller:
         :param value: 
         :return: 
         """
-        self._state_machine[self._chat:self._user] = value
+        self._state_machine.set_state(self._chat, self._user, value)
 
     def get_state(self):
         """
@@ -275,7 +317,7 @@ class Controller:
 
         :return: 
         """
-        return self._state_machine[self._chat:self._user]
+        return self._state_machine.get_state(self._chat, self._user)
 
     def clear(self):
         """
@@ -283,7 +325,7 @@ class Controller:
 
         :return: 
         """
-        del self._state_machine[self._chat:self._user]
+        self._state_machine.del_state(self._chat, self._user)
 
     def get(self, key, default=None):
         """
@@ -363,7 +405,7 @@ class StateMachine:
 
     def __init__(self, dispatcher, states, storage=None):
         if storage is None:
-            storage = StateStorage()
+            storage = MemoryStorage()
 
         self.steps = self._prepare_states(states)
         self.storage = storage
@@ -393,7 +435,7 @@ class StateMachine:
         :return: 
         """
         log.debug(f"Set state for {chat}:{user} to '{state}'")
-        self.storage[chat:user] = state
+        self.storage.set_state(chat, user, state)
 
     def get_state(self, chat, user):
         """
@@ -402,7 +444,7 @@ class StateMachine:
         :param user: 
         :return: 
         """
-        return self.storage[chat:user]
+        return self.storage.get_state(chat, user)
 
     def del_state(self, chat, user):
         """
@@ -412,7 +454,7 @@ class StateMachine:
         :return: 
         """
         log.debug(f"Reset state for {chat}:{user}")
-        del self.storage[chat:user]
+        self.storage.del_state(chat, user)
 
     async def process_message(self, message):
         """
@@ -436,43 +478,3 @@ class StateMachine:
         callback = self.steps[state]
         controller = Controller(self, chat_id, from_user_id, state)
         await callback(message, controller)
-
-    def __setitem__(self, key, value):
-        """
-        Here you can use key or slice-key
-
-        >>> state[chat:user] = "new state"
-        or
-        >>> state[chat] = "new state"
-        :param key: key or slice
-        :param value: new state
-        """
-        if isinstance(key, slice):
-            self.set_state(key.start, key.stop, value)
-        else:
-            self.set_state(key, key, value)
-
-    def __getitem__(self, key):
-        """
-        Here you can use key or slice-key
-
-        >>> state[chat:user]
-        or
-        >>> state[chat]
-        :param key: key or slice
-        :return: state
-        """
-        if isinstance(key, slice):
-            return self.get_state(key.start, key.stop)
-        return self.get_state(key, key)
-
-    def __delitem__(self, key):
-        """
-        Reset user state
-        :param key: 
-        :return: 
-        """
-        if isinstance(key, slice):
-            self.del_state(key.start, key.stop)
-        else:
-            self.del_state(key, key)