No matching distribution found for websockets - RASA installation error

Getting this error during installation:

ERROR: Could not find a version that satisfies the requirement websockets<9.0,>=8.1 (from sanic<21.0.0,>=19.12.2->rasa) (from versions: 1.0, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 3.0, 3.1, 3.2, 3.3, 3.4, 4.0.1, 5.0, 5.0.1, 6.0, 7.0, 8.0, 8.0.1, 8.0.2)

ERROR: No matching distribution found for websockets<9.0,>=8.1 (from sanic<21.0.0,>=19.12.2->rasa)

mac book - 2010, high sierra, 10.13.6
python3 --version
Python 3.6.0 :: Anaconda custom (x86_64)

pip3 --version
pip 20.2.4 from /anaconda/lib/python3.6/site-packages/pip (python 3.6)
on the virtualenv

Hi @mushira33, which version of rasa are you installing?