Ruby 4.0 introduces several improvements to Ractors, including Ractor::Port, making concurrent programming easier and more scalable.

Jan 19, 2026RubyRuby 4.0Concurrency

Ruby 4.0 introduces ZJIT, a next-generation JIT compiler, and Ruby::Box for isolated namespaces that improve performance and modularity.

Jan 04, 2026RubyRuby 4.0Performance