This update will break backward compability with Python 3.6 and works only with Python 3.7+:

Changelog

Used contextvars instead of aiogram.utils.context;
Implemented filters factory;
Implemented new filters mechanism;
Allowed to customize command prefix in CommandsFilter;
Implemented mechanism of passing results from filters (as dicts) as kwargs in handlers (like fixtures in pytest);
Implemented states group feature;
Implemented FSM storage's proxy;
Changed files uploading mechanism;
Implemented pipe for uploading files from URL;
Implemented I18n Middleware;
Errors handlers now should accept only two arguments (current update and exception);
Used aiohttp_socks instead of aiosocksy for Socks4/5 proxy;
types.ContentType was divided to types.ContentType and types.ContentTypes;
Allowed to use rapidjson instead of ujson/json;
.current() method in bot and dispatcher objects was renamed to get_current();

You can read more details about this release in migration FAQ: https://aiogram.readthedocs.io/en/latest/migration_1_to_2.html