[suketa]

Changes

• macOS/Linux: Ruby 4.0.3 → 4.0.4
• Windows: Ruby 4.0.1 → 4.0.3 (latest available on RubyInstaller)
• All platforms: set BUNDLER_VERSION: 0 when matrix.ruby == 'head' to use Ruby's bundled Bundler, working around the broken released Bundler on ruby-head (Make Pathname::SEPARATOR_PAT private ruby/ruby#16895, Use Pathname#absolute? ruby/rubygems#9529)
  • refs CI FAILED with ruby head (ruby 4.1.0dev (2026-05-09T13:08:44Z :detached: 56cd26f835)) #1347

Summary by CodeRabbit

• Chores
  • Updated continuous integration test matrices to use Ruby 4.0.4 across macOS and Ubuntu (4.0.3 on Windows).
  • Enhanced CI workflow configuration for improved Bundler compatibility on Ruby head versions.

[coderabbitai]

📝 Walkthrough

Walkthrough

Three GitHub Actions CI workflow files are updated consistently to bump Ruby versions and introduce conditional Bundler configuration. macOS and Ubuntu test matrices advance from Ruby 4.0.3 to 4.0.4; Windows advances from 4.0.1 to 4.0.3. A BUNDLER_VERSION environment variable is added to all three workflows, set to '0' for ruby-head (to use bundled Bundler) and empty otherwise.

Changes

CI Workflow Matrix and Bundler Configuration

Layer / File(s)	Summary
Test Matrix and Bundler Environment Configuration .github/workflows/test_on_macos.yml, .github/workflows/test_on_ubuntu.yml, .github/workflows/test_on_windows.yml	Ruby version matrix updated to 4.0.4 (macOS/Ubuntu) and 4.0.3 (Windows). Conditional BUNDLER_VERSION environment variable added to use Ruby's bundled Bundler for ruby-head, addressing known Bundler compatibility issues.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related issues

• CI FAILED with ruby head (ruby 4.1.0dev (2026-05-09T13:08:44Z :detached: 56cd26f835)) #1347: The conditional BUNDLER_VERSION environment variable for ruby-head directly addresses the reported Bundler-related CI failures for ruby-head test runs.

Possibly related PRs

• suketa/ruby-duckdb#944: Modifies Windows CI matrix Ruby versions with related Bundler/workflow configuration handling.
• suketa/ruby-duckdb#992: Updates CI Ruby test matrices in the same workflow files to adjust Ruby 4.0.x versions.
• suketa/ruby-duckdb#1338: Updates GitHub Actions CI Ruby versions in Ubuntu/macOS workflows by bumping Ruby 4.0.x.

Poem

🐰 A matrice of versions now dance in align,
From 4.0.3 to 4.0.4, Ruby's design,
Bundlers behave when the head flag appears,
CI workflows fixed, dispelling the fears! 🚀

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The pull request title accurately summarizes the main changes: upgrading Ruby versions and fixing Bundler behavior on ruby-head across all CI platforms.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch upgrade-ruby-400-cli

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