Posted by naruse on 25 Dec 2021 We are pleased to announce the release of Ruby 3.1.0. Ruby 3.1 keeps compatibility with Ruby 3.0 and also adds many features. YJIT: New experimental in-process JIT compiler Ruby 3.1 merges YJIT, a new in-process JIT compiler developed by Shopify. Since Ruby 2.6 introduced MJIT in 2018, its performance greatly improved, and finally we achieved Ruby3x3 last year. But