Ruby 4.0 celebrates 30 years of Ruby with exciting features including ZJIT compiler, Ruby::Box namespaces, redesigned Ractor API, Set as a core class, and several quality-of-life improvements.

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Ruby 4.0 releases on Christmas Day 2025, marking 30 years of Ruby. Major additions include ZJIT, a new JIT compiler designed for easier community contributions; Ruby::Box for isolated namespaces enabling multiple library versions; redesigned Ractor API using Ractor::Port for parallelism; Set and Pathname promoted to core classes; enhanced source_location methods returning 5 elements; String#strip with selectors; new Math methods for precise calculations; and various quality-of-life improvements like logical operators on new lines and instance_variables_to_inspect for cleaner debugging.

What Is New In Ruby 4.0