Ruby 3.3 adds a new parser named Prism, uses Lrama as a parser generator, adds a new pure-Ruby JIT compiler named RJIT, and many performance improvements especially YJIT.
https://ruby-lang.org/en/news/2023/12/25/ruby-3-3-0-released/
Merry Christmas, Happy Holidays, and enjoy programming with Ruby 3.3!
via https://twitter.com/nalsh/status/1739184556996251820