Runtime release briefing — Ruby 3.1 strengthens YJIT and Ractors
Ruby 3.1.0 debuted on 25 December 2021 with a production-ready YJIT, async-friendly Fiber scheduler, and package enhancements, guiding platform teams on interpreter upgrades for Rails and service stacks.
What happened: Ruby 3.1 shipped with YJIT improvements, a new Fiber scheduler API for async I/O, and package management updates.
- Performance planning: Evaluate YJIT in staging to capture CPU savings for long-running Rails applications.
- Concurrency: The Fiber scheduler API enables async frameworks; align adoption with observability updates.
- Packaging: Bundler and RubyGems enhancements necessitate CI pipeline validation.
Next steps: Test Ruby 3.1 with key applications, update container images, and coordinate gem upgrades to avoid compatibility regressions.