ZJIT is now available in Ruby 4.0 — new JIT compiler built into YARV
TL;DR ZJIT, a new just-in-time compiler for Ruby's reference VM (YARV), is included in Ruby 4.0 as compiled-by-default but disabled…
Ruby 4.0.0 Released — major features Ruby Box, ZJIT, Ractor upgrades
TL;DR Ruby 4.0.0 is now available, introducing an experimental isolation feature called Ruby Box, a new JIT compiler named ZJIT,…
Ruby 4.0.0 Released: Ruby Box, ZJIT JIT and Broader Concurrency Updates
TL;DR Ruby 4.0.0 was released on December 25, 2025, introducing an experimental isolation feature called Ruby Box and a new…