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Jan 5, 2026wkelyson

Ruby 4.0 is released with Ruby Box, ZJIT, and performance advances

Ruby 4.0.0 was released on December 25, 2025 and marked one of the most relevant updates to the language in recent years. The new version introduced Ruby Box, ZJIT, important performance improvements, advances in Ractor, and changes that directly affect developers building Ruby and Rails applications.