We're currently in 2.1.5. Ruby 2.3 brought some performance increases, the safe search operator &., and better hash operations. It released almost a full year ago. What are the pros and cons to an update?
Hasn't happen yet
Seems like a good moment for an upgrade, Ruby 2.1 was officially deprecated https://www.ruby-lang.org/en/news/2017/04/01/support-of-ruby-2-1-has-ended/