Because there's nothing to update to. Everyone who was working Python circa 2.7.0 has switched to working on a new, different language which they insist on misleadingly calling "Python 3" rather than come up with a new name like the Perl -> Raku folks did.
I think you are trolling, but in case you aren't; can you elaborate what is so different in Python 3? Granted, it is not a drop-in replacement but it is 99.9% the same thing.
