aiohttp>=2.0.0,<2.3.0
websockets>=4.0,<5.0

aiohttp>=2.0.0,<2.3.0
websockets>=3.0,<4.0

Downgrade websockets due to bugs.
Downgrade websockets due to bugs.

https://github.com/aaugustin/websockets/issues/350 keeps causing too
many issues for too many people for this version to be used by the
public users of this library.
