This is a short post to show the compatibility between Ruby on Rails opens a new window and Ruby opens a new window across different versions. In the process of upgrading really old applications to more modern versions of Ruby and Rails we have run into a lot of these combinations.
![Ruby & Rails Compatibility Table - FastRuby.io | Rails Upgrade Service](https://cdn-ak-scissors.b.st-hatena.com/image/square/385a0972c1cd4c35093b41a3986a83a9cd2aadfe/height=288;version=1;width=512/https%3A%2F%2Ffastruby.io%2Fblog%2Fassets%2Fimages%2Fheader%2Fruby-rails-compatibility-table.jpg)