Which Ruby on Rails is compatible with which Ruby version?

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This is an old question, but the fact that rails is tested against a version of ruby is a good indication that it should work on that version of ruby.

Since 9th April 2019, stable branches of Rails use Buildkite for automated testing, and the list of tested ruby versions, by rails branch, is:

Rails 6.1

  • >= 2.5.0

Rails 6.0

  • >= 2.5.0

Rails 5.2

Rails 5.1

  • >= 2.2.2

Rails 5.0

  • >= 2.2.2

Rails 4.2

  • >= 1.9.3

Rails 4.1

  • >= 1.9.3

Prior to 9th April 2019, stable branches of Rails since 3.0 use travis-ci for automated testing, and the list of tested ruby versions, by rails branch, is:

Rails 3.0

  • 1.8.7
  • 1.9.2
  • 1.9.3

Rails 3.1

  • 1.8.7
  • 1.9.2
  • 1.9.3

Rails 3.2

  • 1.8.7
  • 1.9.2
  • 1.9.3
  • 2.0.0
  • 2.1.8
  • 2.2.6
  • 2.3.3

Rails 4.0

  • 1.9.3
  • 2.0.0
  • 2.1
  • 2.2

Rails 4.1

  • 1.9.3
  • 2.0.0
  • 2.1
  • 2.2.4
  • 2.3.0

Rails 4.2

  • 1.9.3
  • 2.0.0-p648
  • 2.1.10
  • 2.2.10
  • 2.3.8
  • 2.4.5

Rails 5.0

  • 2.2.10
  • 2.3.8
  • 2.4.5

Rails 5.1

  • 2.2.10
  • 2.3.7
  • 2.4.4
  • 2.5.1

Rails 5.2

  • 2.2.10
  • 2.3.7
  • 2.4.4
  • 2.5.1

Rails 6.0

  • 2.5.3
  • 2.6.0

(From https://www.hmallett.co.uk/2018/08/ruby-and-ruby-on-rails-version-compatibility/)

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