as the title states, I’m looking for a recommended path for app (ruby 2.3.8 , rails 4.2.11) to the latest stable versions of ruby and rails, that is the safest, most stable option for a very, very large codebase.
is it better to first upgrade ruby to 2.4 , then 2.5 and so on, and then come back around to upgrading rails in small steps (e.g. 4.2 => 5.0.x => 5.1.x => …) ?
what ruby version is the latest version that can be used to run rails 4.2.x ?
any recommendations / guidance would be greatly appreciated.