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Add Ruby 4.0 support#6

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kwent wants to merge 1 commit into
luizfonseca:masterfrom
kwent:feat/ruby-4-support
Open

Add Ruby 4.0 support#6
kwent wants to merge 1 commit into
luizfonseca:masterfrom
kwent:feat/ruby-4-support

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@kwent kwent commented Jan 15, 2026

Summary

  • Upgrade base Docker image from Ruby 3.3.1 to Ruby 4.0 (bookworm)
  • Update all RuboCop gems to latest versions for Ruby 4.0 compatibility
  • Update documentation to reflect Ruby 4.0 support

Changes

  • Dockerfile: Updated base image to ruby:4-slim-bookworm
  • Gem versions:
    • rubocop: 1.63.4 → 1.82.1
    • rubocop-rspec: 2.29.2 → 3.9.0
    • rubocop-performance: 1.21.0 → 1.26.1
    • rubocop-rails: 2.24.1 → 2.34.3
  • README.md: Updated gem versions and Ruby version support documentation

Test plan

  • Docker build succeeds
  • Ruby 4.0.1 confirmed in container
  • All gems install successfully
  • Documentation updated

This follows the same pattern as the Ruby 3 support upgrade (#5).

Update base image to ruby:4-slim-bookworm and upgrade all RuboCop gems
to their latest versions for Ruby 4.0 compatibility.
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