When running bundle install I was getting this error:
Fetching gem metadata from https://rubygems.org/
Fetching gem metadata from https://rubygems.org/........
google-api-client-0.38.0 requires ruby version ~> 2.4, which is incompatible
with the current version, ruby 3.0.2p107
Couldn't find a fix/reason, answer below (thought I'd post this to help someone else/took me a 1 hour to find a fix).