diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
index c4430ef6..d643b3f0 100644
--- a/.github/FUNDING.yml
+++ b/.github/FUNDING.yml
@@ -1 +1,2 @@
 open_collective: aiogram
+patreon: aiogram
diff --git a/aiogram/__init__.py b/aiogram/__init__.py
index ef832be9..590afc50 100644
--- a/aiogram/__init__.py
+++ b/aiogram/__init__.py
@@ -43,5 +43,5 @@ __all__ = (
     'utils',
 )
 
-__version__ = '2.12'
+__version__ = '2.12.1'
 __api_version__ = '5.1'
diff --git a/aiogram/bot/bot.py b/aiogram/bot/bot.py
index 85be7fd0..4b6c4c0b 100644
--- a/aiogram/bot/bot.py
+++ b/aiogram/bot/bot.py
@@ -161,8 +161,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         files = {}
         prepare_file(payload, files, 'certificate', certificate)
 
-        result = await self.request(api.Methods.SET_WEBHOOK, payload, files)
-        return result
+        return await self.request(api.Methods.SET_WEBHOOK, payload, files)
 
     async def delete_webhook(self,
                              drop_pending_updates: typing.Optional[base.Boolean] = None,
@@ -181,8 +180,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.DELETE_WEBHOOK, payload)
-        return result
+        return await self.request(api.Methods.DELETE_WEBHOOK, payload)
 
     async def get_webhook_info(self) -> types.WebhookInfo:
         """
@@ -232,8 +230,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.LOG_OUT, payload)
-        return result
+        return await self.request(api.Methods.LOG_OUT, payload)
 
     @deprecated("This method will be renamed to `close` in aiogram v3.0")
     async def close_bot(self) -> base.Boolean:
@@ -251,8 +248,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.CLOSE, payload)
-        return result
+        return await self.request(api.Methods.CLOSE, payload)
 
     async def send_message(self,
                            chat_id: typing.Union[base.Integer, base.String],
@@ -1506,8 +1502,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.SEND_CHAT_ACTION, payload)
-        return result
+        return await self.request(api.Methods.SEND_CHAT_ACTION, payload)
 
     async def get_user_profile_photos(self, user_id: base.Integer, offset: typing.Optional[base.Integer] = None,
                                       limit: typing.Optional[base.Integer] = None) -> types.UserProfilePhotos:
@@ -1593,8 +1588,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         until_date = prepare_arg(until_date)
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.KICK_CHAT_MEMBER, payload)
-        return result
+        return await self.request(api.Methods.KICK_CHAT_MEMBER, payload)
 
     async def unban_chat_member(self,
                                 chat_id: typing.Union[base.Integer, base.String],
@@ -1627,8 +1621,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.UNBAN_CHAT_MEMBER, payload)
-        return result
+        return await self.request(api.Methods.UNBAN_CHAT_MEMBER, payload)
 
     async def restrict_chat_member(self, chat_id: typing.Union[base.Integer, base.String],
                                    user_id: base.Integer,
@@ -1683,8 +1676,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
                               f"passing regular argument {payload[permission]}",
                               DeprecationWarning, stacklevel=2)
 
-        result = await self.request(api.Methods.RESTRICT_CHAT_MEMBER, payload)
-        return result
+        return await self.request(api.Methods.RESTRICT_CHAT_MEMBER, payload)
 
     async def promote_chat_member(self,
                                   chat_id: typing.Union[base.Integer, base.String],
@@ -1756,8 +1748,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.PROMOTE_CHAT_MEMBER, payload)
-        return result
+        return await self.request(api.Methods.PROMOTE_CHAT_MEMBER, payload)
 
     async def set_chat_administrator_custom_title(self, chat_id: typing.Union[base.Integer, base.String],
                                                   user_id: base.Integer, custom_title: base.String) -> base.Boolean:
@@ -1775,8 +1766,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.SET_CHAT_ADMINISTRATOR_CUSTOM_TITLE, payload)
-        return result
+        return await self.request(api.Methods.SET_CHAT_ADMINISTRATOR_CUSTOM_TITLE, payload)
 
     async def set_chat_permissions(self, chat_id: typing.Union[base.Integer, base.String],
                                    permissions: types.ChatPermissions) -> base.Boolean:
@@ -1794,8 +1784,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         permissions = prepare_arg(permissions)
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.SET_CHAT_PERMISSIONS, payload)
-        return result
+        return await self.request(api.Methods.SET_CHAT_PERMISSIONS, payload)
 
     async def export_chat_invite_link(self, chat_id: typing.Union[base.Integer, base.String]) -> base.String:
         """
@@ -1811,8 +1800,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.EXPORT_CHAT_INVITE_LINK, payload)
-        return result
+        return await self.request(api.Methods.EXPORT_CHAT_INVITE_LINK, payload)
 
     async def create_chat_invite_link(self,
                                       chat_id: typing.Union[base.Integer, base.String],
@@ -1846,8 +1834,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         expire_date = prepare_arg(expire_date)
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.CREATE_CHAT_INVITE_LINK, payload)
-        return result
+        return await self.request(api.Methods.CREATE_CHAT_INVITE_LINK, payload)
 
     async def edit_chat_invite_link(self,
                                     chat_id: typing.Union[base.Integer, base.String],
@@ -1883,8 +1870,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         expire_date = prepare_arg(expire_date)
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.EDIT_CHAT_INVITE_LINK, payload)
-        return result
+        return await self.request(api.Methods.EDIT_CHAT_INVITE_LINK, payload)
 
     async def revoke_chat_invite_link(self,
                                       chat_id: typing.Union[base.Integer, base.String],
@@ -1905,8 +1891,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.REVOKE_CHAT_INVITE_LINK, payload)
-        return result
+        return await self.request(api.Methods.REVOKE_CHAT_INVITE_LINK, payload)
 
     async def set_chat_photo(self, chat_id: typing.Union[base.Integer, base.String],
                              photo: base.InputFile) -> base.Boolean:
@@ -1931,8 +1916,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         files = {}
         prepare_file(payload, files, 'photo', photo)
 
-        result = await self.request(api.Methods.SET_CHAT_PHOTO, payload, files)
-        return result
+        return await self.request(api.Methods.SET_CHAT_PHOTO, payload, files)
 
     async def delete_chat_photo(self, chat_id: typing.Union[base.Integer, base.String]) -> base.Boolean:
         """
@@ -1951,8 +1935,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.DELETE_CHAT_PHOTO, payload)
-        return result
+        return await self.request(api.Methods.DELETE_CHAT_PHOTO, payload)
 
     async def set_chat_title(self, chat_id: typing.Union[base.Integer, base.String],
                              title: base.String) -> base.Boolean:
@@ -1974,8 +1957,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.SET_CHAT_TITLE, payload)
-        return result
+        return await self.request(api.Methods.SET_CHAT_TITLE, payload)
 
     async def set_chat_description(self, chat_id: typing.Union[base.Integer, base.String],
                                    description: typing.Optional[base.String] = None) -> base.Boolean:
@@ -1994,8 +1976,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.SET_CHAT_DESCRIPTION, payload)
-        return result
+        return await self.request(api.Methods.SET_CHAT_DESCRIPTION, payload)
 
     async def pin_chat_message(self,
                                chat_id: typing.Union[base.Integer, base.String],
@@ -2027,8 +2008,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.PIN_CHAT_MESSAGE, payload)
-        return result
+        return await self.request(api.Methods.PIN_CHAT_MESSAGE, payload)
 
     async def unpin_chat_message(self,
                                  chat_id: typing.Union[base.Integer, base.String],
@@ -2056,8 +2036,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.UNPIN_CHAT_MESSAGE, payload)
-        return result
+        return await self.request(api.Methods.UNPIN_CHAT_MESSAGE, payload)
 
     async def unpin_all_chat_messages(self,
                                       chat_id: typing.Union[base.Integer, base.String],
@@ -2079,8 +2058,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.UNPIN_ALL_CHAT_MESSAGES, payload)
-        return result
+        return await self.request(api.Methods.UNPIN_ALL_CHAT_MESSAGES, payload)
 
     async def leave_chat(self, chat_id: typing.Union[base.Integer, base.String]) -> base.Boolean:
         """
@@ -2095,8 +2073,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.LEAVE_CHAT, payload)
-        return result
+        return await self.request(api.Methods.LEAVE_CHAT, payload)
 
     async def get_chat(self, chat_id: typing.Union[base.Integer, base.String]) -> types.Chat:
         """
@@ -2148,8 +2125,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.GET_CHAT_MEMBERS_COUNT, payload)
-        return result
+        return await self.request(api.Methods.GET_CHAT_MEMBERS_COUNT, payload)
 
     async def get_chat_member(self, chat_id: typing.Union[base.Integer, base.String],
                               user_id: base.Integer) -> types.ChatMember:
@@ -2190,8 +2166,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.SET_CHAT_STICKER_SET, payload)
-        return result
+        return await self.request(api.Methods.SET_CHAT_STICKER_SET, payload)
 
     async def delete_chat_sticker_set(self, chat_id: typing.Union[base.Integer, base.String]) -> base.Boolean:
         """
@@ -2210,8 +2185,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.DELETE_CHAT_STICKER_SET, payload)
-        return result
+        return await self.request(api.Methods.DELETE_CHAT_STICKER_SET, payload)
 
     async def answer_callback_query(self, callback_query_id: base.String,
                                     text: typing.Optional[base.String] = None,
@@ -2245,8 +2219,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.ANSWER_CALLBACK_QUERY, payload)
-        return result
+        return await self.request(api.Methods.ANSWER_CALLBACK_QUERY, payload)
 
     async def set_my_commands(self, commands: typing.List[types.BotCommand]) -> base.Boolean:
         """
@@ -2263,8 +2236,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         commands = prepare_arg(commands)
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.SET_MY_COMMANDS, payload)
-        return result
+        return await self.request(api.Methods.SET_MY_COMMANDS, payload)
 
     async def get_my_commands(self) -> typing.List[types.BotCommand]:
         """
@@ -2510,8 +2482,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.DELETE_MESSAGE, payload)
-        return result
+        return await self.request(api.Methods.DELETE_MESSAGE, payload)
 
     # === Stickers ===
     # https://core.telegram.org/bots/api#stickers
@@ -2652,8 +2623,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         prepare_file(payload, files, 'png_sticker', png_sticker)
         prepare_file(payload, files, 'tgs_sticker', tgs_sticker)
 
-        result = await self.request(api.Methods.CREATE_NEW_STICKER_SET, payload, files)
-        return result
+        return await self.request(api.Methods.CREATE_NEW_STICKER_SET, payload, files)
 
     async def add_sticker_to_set(self,
                                  user_id: base.Integer,
@@ -2698,8 +2668,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         prepare_file(payload, files, 'png_sticker', png_sticker)
         prepare_file(payload, files, 'tgs_sticker', tgs_sticker)
 
-        result = await self.request(api.Methods.ADD_STICKER_TO_SET, payload, files)
-        return result
+        return await self.request(api.Methods.ADD_STICKER_TO_SET, payload, files)
 
     async def set_sticker_position_in_set(self, sticker: base.String, position: base.Integer) -> base.Boolean:
         """
@@ -2715,9 +2684,8 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         :rtype: :obj:`base.Boolean`
         """
         payload = generate_payload(**locals())
-        result = await self.request(api.Methods.SET_STICKER_POSITION_IN_SET, payload)
 
-        return result
+        return await self.request(api.Methods.SET_STICKER_POSITION_IN_SET, payload)
 
     async def delete_sticker_from_set(self, sticker: base.String) -> base.Boolean:
         """
@@ -2732,8 +2700,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.DELETE_STICKER_FROM_SET, payload)
-        return result
+        return await self.request(api.Methods.DELETE_STICKER_FROM_SET, payload)
 
     async def set_sticker_set_thumb(self,
                                     name: base.String,
@@ -2765,8 +2732,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         files = {}
         prepare_file(payload, files, 'thumb', thumb)
 
-        result = await self.request(api.Methods.SET_STICKER_SET_THUMB, payload, files)
-        return result
+        return await self.request(api.Methods.SET_STICKER_SET_THUMB, payload, files)
 
     async def answer_inline_query(self, inline_query_id: base.String,
                                   results: typing.List[types.InlineQueryResult],
@@ -2809,8 +2775,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         results = prepare_arg(results)
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.ANSWER_INLINE_QUERY, payload)
-        return result
+        return await self.request(api.Methods.ANSWER_INLINE_QUERY, payload)
 
     # === Payments ===
     # https://core.telegram.org/bots/api#payments
@@ -2958,8 +2923,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
                                             for shipping_option in shipping_options])
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.ANSWER_SHIPPING_QUERY, payload)
-        return result
+        return await self.request(api.Methods.ANSWER_SHIPPING_QUERY, payload)
 
     async def answer_pre_checkout_query(self, pre_checkout_query_id: base.String, ok: base.Boolean,
                                         error_message: typing.Optional[base.String] = None) -> base.Boolean:
@@ -2986,8 +2950,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         """
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.ANSWER_PRE_CHECKOUT_QUERY, payload)
-        return result
+        return await self.request(api.Methods.ANSWER_PRE_CHECKOUT_QUERY, payload)
 
     # === Games ===
     # https://core.telegram.org/bots/api#games
@@ -3018,8 +2981,7 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         errors = prepare_arg(errors)
         payload = generate_payload(**locals())
 
-        result = await self.request(api.Methods.SET_PASSPORT_DATA_ERRORS, payload)
-        return result
+        return await self.request(api.Methods.SET_PASSPORT_DATA_ERRORS, payload)
 
     # === Games ===
     # https://core.telegram.org/bots/api#games
diff --git a/aiogram/dispatcher/dispatcher.py b/aiogram/dispatcher/dispatcher.py
index a2736cf7..d471fe86 100644
--- a/aiogram/dispatcher/dispatcher.py
+++ b/aiogram/dispatcher/dispatcher.py
@@ -11,7 +11,7 @@ from aiohttp.helpers import sentinel
 from aiogram.utils.deprecated import renamed_argument
 from .filters import Command, ContentTypeFilter, ExceptionsFilter, FiltersFactory, HashTag, Regexp, \
     RegexpCommandsFilter, StateFilter, Text, IDFilter, AdminFilter, IsReplyFilter, ForwardedMessageFilter, \
-    IsSenderContact, ChatTypeFilter, AbstractFilter
+    IsSenderContact, ChatTypeFilter, MediaGroupFilter, AbstractFilter
 from .handler import Handler
 from .middlewares import MiddlewareManager
 from .storage import BaseStorage, DELTA, DisabledStorage, EXCEEDED_COUNT, FSMContext, \
@@ -204,6 +204,12 @@ class Dispatcher(DataMixin, ContextInstanceMixin):
             self.my_chat_member_handlers,
             self.chat_member_handlers
         ])
+        filters_factory.bind(MediaGroupFilter, event_handlers=[
+            self.message_handlers,
+            self.edited_channel_post_handlers,
+            self.channel_post_handlers,
+            self.edited_channel_post_handlers
+        ])
 
     def __del__(self):
         self.stop_polling()
diff --git a/aiogram/dispatcher/filters/__init__.py b/aiogram/dispatcher/filters/__init__.py
index d64a2667..d07d953b 100644
--- a/aiogram/dispatcher/filters/__init__.py
+++ b/aiogram/dispatcher/filters/__init__.py
@@ -1,7 +1,7 @@
 from .builtin import Command, CommandHelp, CommandPrivacy, CommandSettings, CommandStart, ContentTypeFilter, \
     ExceptionsFilter, HashTag, Regexp, RegexpCommandsFilter, StateFilter, \
     Text, IDFilter, AdminFilter, IsReplyFilter, IsSenderContact, ForwardedMessageFilter, \
-    ChatTypeFilter
+    ChatTypeFilter, MediaGroupFilter
 from .factory import FiltersFactory
 from .filters import AbstractFilter, BoundFilter, Filter, FilterNotPassed, FilterRecord, execute_filter, \
     check_filters, get_filter_spec, get_filters_spec
@@ -25,6 +25,7 @@ __all__ = (
     'IsSenderContact',
     'ForwardedMessageFilter',
     'ChatTypeFilter',
+    'MediaGroupFilter',
     'FiltersFactory',
     'AbstractFilter',
     'BoundFilter',
diff --git a/aiogram/dispatcher/filters/builtin.py b/aiogram/dispatcher/filters/builtin.py
index 762c8505..c32c53be 100644
--- a/aiogram/dispatcher/filters/builtin.py
+++ b/aiogram/dispatcher/filters/builtin.py
@@ -738,3 +738,20 @@ class ChatTypeFilter(BoundFilter):
             return False
 
         return obj.type in self.chat_type
+    
+    
+class MediaGroupFilter(BoundFilter):
+    """
+    Check if message is part of a media group.
+
+    `is_media_group=True` - the message is part of a media group
+    `is_media_group=False` - the message is NOT part of a media group
+    """
+
+    key = "is_media_group"
+
+    def __init__(self, is_media_group: bool):
+        self.is_media_group = is_media_group
+
+    async def check(self, message: types.Message) -> bool:
+        return bool(getattr(message, "media_group_id")) is self.is_media_group
diff --git a/aiogram/dispatcher/handler.py b/aiogram/dispatcher/handler.py
index 38219012..10a94924 100644
--- a/aiogram/dispatcher/handler.py
+++ b/aiogram/dispatcher/handler.py
@@ -25,8 +25,7 @@ class CancelHandler(Exception):
 def _get_spec(func: callable):
     while hasattr(func, '__wrapped__'):  # Try to resolve decorated callbacks
         func = func.__wrapped__
-    spec = inspect.getfullargspec(func)
-    return spec
+    return inspect.getfullargspec(func)
 
 
 def _check_spec(spec: inspect.FullArgSpec, kwargs: dict):
diff --git a/aiogram/dispatcher/webhook.py b/aiogram/dispatcher/webhook.py
index b6280ed1..52191870 100644
--- a/aiogram/dispatcher/webhook.py
+++ b/aiogram/dispatcher/webhook.py
@@ -116,8 +116,7 @@ class WebhookRequestHandler(web.View):
         :return: :class:`aiogram.types.Update`
         """
         data = await self.request.json()
-        update = types.Update(**data)
-        return update
+        return types.Update(**data)
 
     async def post(self):
         """
diff --git a/aiogram/types/base.py b/aiogram/types/base.py
index 373f47be..0ed8579c 100644
--- a/aiogram/types/base.py
+++ b/aiogram/types/base.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import io
+import logging
 import typing
 from typing import TypeVar
 
@@ -26,6 +27,9 @@ Float = TypeVar('Float', bound=float)
 Boolean = TypeVar('Boolean', bound=bool)
 T = TypeVar('T')
 
+# Main aiogram logger
+log = logging.getLogger('aiogram')
+
 
 class MetaTelegramObject(type):
     """
@@ -225,7 +229,9 @@ class TelegramObject(ContextInstanceMixin, metaclass=MetaTelegramObject):
         if key in self.props:
             return self.props[key].set_value(self, value, self.conf.get('parent', None))
         self.values[key] = value
-        raise KeyError(key)
+
+        # Log warning when Telegram silently adds new Fields
+        log.warning("Field '%s' doesn't exist in %s", key, self.__class__)
 
     def __contains__(self, item: str) -> bool:
         """
diff --git a/aiogram/types/chat.py b/aiogram/types/chat.py
index b9e03983..3b0a7b9d 100644
--- a/aiogram/types/chat.py
+++ b/aiogram/types/chat.py
@@ -35,6 +35,7 @@ class Chat(base.TelegramObject):
     pinned_message: 'Message' = fields.Field(base='Message')
     permissions: ChatPermissions = fields.Field(base=ChatPermissions)
     slow_mode_delay: base.Integer = fields.Field()
+    message_auto_delete_time: base.Integer = fields.Field()
     sticker_set_name: base.String = fields.Field()
     can_set_sticker_set: base.Boolean = fields.Field()
     linked_chat_id: base.Integer = fields.Field()
@@ -607,6 +608,15 @@ class Chat(base.TelegramObject):
             invite_link=invite_link,
         )
 
+    async def delete_message(self,
+                             message_id: base.Integer,
+                             ) -> base.Boolean:
+        """ Shortcut for deleteMessage method. """
+        return await self.bot.delete_message(
+            chat_id=self.id,
+            message_id=message_id,
+        )
+
     def __int__(self):
         return self.id
 
diff --git a/aiogram/types/chat_member_updated.py b/aiogram/types/chat_member_updated.py
index 7c6a124f..67c75616 100644
--- a/aiogram/types/chat_member_updated.py
+++ b/aiogram/types/chat_member_updated.py
@@ -15,7 +15,7 @@ class ChatMemberUpdated(base.TelegramObject):
     https://core.telegram.org/bots/api#chatmemberupdated
     """
     chat: Chat = fields.Field(base=Chat)
-    from_user: User = fields.Field(base=User)
+    from_user: User = fields.Field(alias="from", base=User)
     date: datetime.datetime = fields.DateTimeField()
     old_chat_member: ChatMember = fields.Field(base=ChatMember)
     new_chat_member: ChatMember = fields.Field(base=ChatMember)
diff --git a/aiogram/types/document.py b/aiogram/types/document.py
index e15b745d..c3d19fa9 100644
--- a/aiogram/types/document.py
+++ b/aiogram/types/document.py
@@ -2,6 +2,7 @@ from . import base
 from . import fields
 from . import mixins
 from .photo_size import PhotoSize
+from ..utils import helper
 
 
 class Document(base.TelegramObject, mixins.Downloadable):
@@ -16,3 +17,34 @@ class Document(base.TelegramObject, mixins.Downloadable):
     file_name: base.String = fields.Field()
     mime_type: base.String = fields.Field()
     file_size: base.Integer = fields.Field()
+
+    @property
+    def mime_base(self) -> str:
+        base_type, _, _ = self.mime_type.partition('/')
+        return base_type
+
+    @property
+    def mime_subtype(self) -> str:
+        _, _, subtype = self.mime_type.partition('/')
+        return subtype
+
+
+class MimeBase(helper.Helper):
+    """
+    List of mime base types registered in IANA
+
+    https://www.iana.org/assignments/media-types/media-types.xhtml
+    """
+
+    mode = helper.HelperMode.lowercase
+
+    APPLICATION = helper.Item()  # application
+    AUDIO = helper.Item()  # audio
+    EXAMPLE = helper.Item()  # example
+    FONT = helper.Item()  # font
+    IMAGE = helper.Item()  # image
+    MESSAGE = helper.Item()  # message
+    MODEL = helper.Item()  # model
+    MULTIPART = helper.Item()  # multipart
+    TEXT = helper.Item()  # text
+    VIDEO = helper.Item()  # video
diff --git a/aiogram/utils/text_decorations.py b/aiogram/utils/text_decorations.py
index 4de8d69a..09484e3c 100644
--- a/aiogram/utils/text_decorations.py
+++ b/aiogram/utils/text_decorations.py
@@ -55,12 +55,11 @@ class TextDecoration(ABC):
         :param entities: Array of MessageEntities
         :return:
         """
-        result = "".join(
+        return "".join(
             self._unparse_entities(
                 self._add_surrogates(text), sorted(entities, key=lambda item: item.offset) if entities else []
             )
         )
-        return result
 
     def _unparse_entities(
         self,
diff --git a/docs/source/dispatcher/filters.rst b/docs/source/dispatcher/filters.rst
index b8f4962e..a47e396e 100644
--- a/docs/source/dispatcher/filters.rst
+++ b/docs/source/dispatcher/filters.rst
@@ -155,6 +155,14 @@ ChatTypeFilter
 .. autoclass:: aiogram.dispatcher.filters.ChatTypeFilter
     :members:
     :show-inheritance:
+    
+
+MediaGroupFilter
+-------------
+
+.. autoclass:: aiogram.dispatcher.filters.MediaGroupFilter
+    :members:
+    :show-inheritance:
 
 
 Making own filters (Custom filters)
diff --git a/examples/chat_type_filter.py b/examples/chat_type_filter.py
index e57f8825..9db13cb8 100644
--- a/examples/chat_type_filter.py
+++ b/examples/chat_type_filter.py
@@ -19,12 +19,12 @@ bot = Bot(token=API_TOKEN)
 dp = Dispatcher(bot)
 
 
-@dp.message_handler(chat_type=[ChatType.PRIVATE, ChatType.CHANNEL])
+@dp.message_handler(chat_type=[ChatType.PRIVATE, ChatType.SUPERGROUP])
 async def send_welcome(message: types.Message):
     """
-    This handler will be called when user sends message in private chat or channel
+    This handler will be called when user sends message in private chat or supergroup
     """
-    await message.reply("Hi!\nI'm hearing your messages in private chats and channels")
+    await message.reply("Hi!\nI'm hearing your messages in private chats and supergroups")
 
     # propagate message to the next handler
     raise SkipHandler