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chore(deps): upgrade Ruby 4.0.6 to 4.0.9 - #3056
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Patch-level bump to the current stable release in the 4.0 series (4.1.0 is preview1 only, not a candidate). .ruby-version and the Gemfile.lock RUBY VERSION entry, nothing else; Gemfile reads the version from .ruby-version. Verified against ruby-lang.org and the ruby-build definitions Heroku's buildpack uses (4.0.9 is available on the Heroku-26 stack).
mroderick
marked this pull request as ready for review
October 24, 2026 06:39
olleolleolle
approved these changes
Oct 25, 2026
olleolleolle
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olleolleolle
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Do we really only have a single place for version, that's great.
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Summary
Upgrades the repo from Ruby 4.0.6 to 4.0.9, the current stable patch release in the 4.0 series. 4.1.0 exists only as preview1, so it is not a candidate. Heroku's buildpack resolves 4.0.9 via its ruby-build definitions, so the Heroku-26 deploy picks it up automatically from
.ruby-version.Key changes
.ruby-version: 4.0.6 → 4.0.9Gemfile.lockRUBY VERSIONentry, matching. No other gem changes.Detail
Version verified against ruby-lang.org's downloads page and cache.ruby-lang.org's index (4.0.9 tarballs, released 2026-10-23 per ruby/ruby tags), and against the rbenv/ruby-build definition used by heroku-buildpack-ruby. The Gemfile sources the Ruby version from
.ruby-version, so no Gemfile edit was needed. Verified locally: RuboCop clean (454 files), full suite green — 1746 examples, 0 failures across the 3-process parallel run on Ruby 4.0.9.Review notes
Small diff, no special focus expected. Deliberately not done: no 4.1.0-preview trial and no gem version bumps — this PR is the Ruby patch only.