Each time you need to update your existing Ruby On Rail version when new is released with many major and minor features and functionality that helps you to be updated and remains suitable with new technologies and hardware. Here is a version that helps you to understand which version you have and in which you need to transfer.
• Rails 6 requires Ruby 2.5.0 or newer.
• Rails 5 requires Ruby 2.2.2 or newer.
• Rails 4 prefers Ruby 2.0 and requires 1.9.3 or newer.
• Rails 3.2.x is the last branch to support Ruby 1.8.7.
• Rails 3 and above require Ruby 1.8.7 or higher. Support for all of the previous Ruby versions has been dropped officially. You should upgrade as early as possible.
If you have any query related to Ruby On Rails version up-gradation, please feel and send your queries or request quote!