Conda install fastai=2.4 forces downgrade to python=1.8

My understanding was that 2.4 specifically adds compatibility with pytorch=1.9

Inversely, upgrading to pytorch=1.9 forceably downgraded my fastai=1.0.61 !!

I checked the requirements.yml and did a conda search --info fastai=2.4 and it looks good.

What am I missing?