Ruby 4.0: ZJIT, Ruby Box, and Ractors

· fastruby.io · Sept. 1, 2026, 6:03 p.m.
ruby ruby programming-languages software development Ractors
Summary
Ruby 4.0 introduces new features including ZJIT, Ruby Box, and Ractor::Port API. While two of these features are opt-in experiments, one involves the removal of four existing Ractor methods. This post discusses the implications for upgrading to Ruby 4.0.
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