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Ruby isn’t being rewritten in Rust — but Rust is already part of Ruby.

by Giménez Silva Germán Alberto —

https://rubystacknews.com/2026/02/27/%f0%9f%a6%80-rust-inside-ruby-core-a-new-systems-layer-for-mri/

YJIT, the production JIT compiler included in modern Ruby versions, uses Rust to generate native machine code at runtime. It’s one of the most significant architectural changes in MRI in years, even if most developers never notice it directly.

I wrote a deep dive explaining where Rust fits in the runtime and why this matters.

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