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Ruby & Rails Version Matrix

“I’m stuck with upgrading a Rails app from 3.x to something – anything! – newer. Just #$&! kill me now.”

Chances are you will be given a limping Rails application written years ago by someone else that never made the upgrade to more recent versions. It’s a pain in the ass to figure out which version of Ruby to use for the version of Rails you are upgrading to.

This is a summary of several sources for which versions of Ruby are required and recommended for different Rails releases.

Rails version Ruby version Ruby end-of-life Rails end-of-life
6.0.0.beta1 >= 2.5.0
5.0.0beta1 to 5.2.2 >= 2.2.2
4.2.1 to 4.2.11 >= 1.9.3, 2.2 recommended
4.1 to 4.2.0 >= 1.9.3, 2.1 recommended
4.0.5 to 4.1.0.rc2 >= 1.9.3 February 23, 2015 4.1.x December 18. 2015
4.0.0.beta1 to 4.0.4 >= 1.8.7 June 2013 4.x March 20, 2017
3.2.22 to 3.2.22.5 1.8.7, 2.2 recommended
3.2.13 to 3.2.22.4 1.8.7, 2.0 recommended
0.8.0 to 3.2.13.rc2 1.8.7 June 2013 3.2.22 June 16, 2015

Sources:

https://www.devalot.com/articles/2012/03/ror-compatibility

https://stackoverflow.com/questions/9087116/which-ruby-on-rails-is-compatible-with-which-ruby-version

https://weblog.rubyonrails.org/2013/2/27/Rails-3-2-13-rc1-has-been-released/

https://weblog.rubyonrails.org/2015/6/16/Rails-3-2-22-4-1-11-and-4-2-2-have-been-released-and-more/