I haven't been in the Ruby world in recent years, but I remember regularly running into issues where I needed multiple versions of a gem, or even gem/rubylang v

I haven't been in the Ruby world in recent years, but I remember regularly running into issues where I needed multiple versions of a gem, or even gem/rubylang version combinations. I think rvm and gemsets(?) sort of helped, but it was still messy. How has this issue been addressed, assuming it has? I do rather like how more contemporary package managers just tend to install things locally (Node, Elixir, etc.), and I'm curious how things have evolved in the Ruby (and Python) ecosystems.