Деплой телеграм-бота на heroku

Стараюсь задеплоить своего бота на Heroku. Делаю по инструкции из ютуба
https://www.youtube.com/watch?v=TtvNVDilh60&t=727s
На последнем шаге выскакивает такой эрор:

git push heroku master
Enumerating objects: 15, done.
Counting objects: 100% (15/15), done.
Delta compression using up to 4 threads
Compressing objects: 100% (10/10), done.
Writing objects: 100% (15/15), 3.24 KiB | 829.00 KiB/s, done.
Total 15 (delta 3), reused 0 (delta 0), pack-reused 0
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Building on the Heroku-20 stack
remote: -----> Determining which buildpack to use for this app
remote: -----> Python app detected
remote: -----> Using Python version specified in runtime.txt
remote: ! Requested runtime (aiogram
remote: aiohttp
remote: requests
remote: asyncio) is not available for this stack (heroku-20).
remote: ! Aborting. More info: https://devcenter.heroku.com/articles/python-support
remote: ! Push rejected, failed to compile Python app.
remote:
remote: ! Push failed

суть ошибки - Requested runtime (aiogram
remote: aiohttp
remote: requests
remote: asyncio) is not available for this stack (heroku-20).

Вопрос, а где можно посмотреть какие библиотеки входят в этот heroku-20?