aiohttp>=1.0.0,<1.1.0
websockets>=3.1,<4.0

aiohttp>=2.0.0,<2.1.0
websockets>=3.1,<4.0

Upgrade aiohttp requirement to 2.0.
Upgrade aiohttp requirement to 2.0.

Apparently this doesn't cause any issues with the existing code as-is.
I suspect the real issue will be with people's third party code.
