What's Changed

• Serialize CaskStructs in the internal API by @Rylan12 in https://github.com/Homebrew/brew/pull/21502
• Enable strict typing in Homebrew::TestBot (take 3) by @dduugg in https://github.com/Homebrew/brew/pull/21576
• github_runner_matrix: skip newer intel CI unless exact tag by @cho-m in https://github.com/Homebrew/brew/pull/21620
• Homebrew 5.1.0 deprecations/disables/deletions by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/21629
• Cleanup Download Queue by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/21638
• rubocops/urls: collect all livecheck urls by @samford in https://github.com/Homebrew/brew/pull/21647
• formula_auditor: only audit compatibility_version on valid platform by @cho-m in https://github.com/Homebrew/brew/pull/21649
• Remove deprecation check in autobump logic by @SMillerDev in https://github.com/Homebrew/brew/pull/21651
• Fix issue with missing ruby_soruce_checksum in CaskStruct by @Rylan12 in https://github.com/Homebrew/brew/pull/21653
• Autobump resources with livecheck blocks by @nandahkrishna in https://github.com/Homebrew/brew/pull/21623
• Remove API placeholders in FormulaStruct and CaskStruct by @Rylan12 in https://github.com/Homebrew/brew/pull/21656
• bundle: auto-tap formulae or casks in brew bundle by @gibfahn in https://github.com/Homebrew/brew/pull/21654
• Handle missing cask methods. by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/21657
• bump-formula-pr: add checkbox that suggests to check comment annotations by @botantony in https://github.com/Homebrew/brew/pull/21658
• dev-cmd/tests: remove HOMEBREW_REALLY_USE_INTERNAL_API from environment by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/21663
• bump-formula-pr: remove unnecessary newlines by @botantony in https://github.com/Homebrew/brew/pull/21660
• Fix display on "dumb" terminals by @stac47 in https://github.com/Homebrew/brew/pull/21659
• dev-cmd/irb: use irb executable instead of gem by @Bo98 in https://github.com/Homebrew/brew/pull/21661
• Portable Ruby 4.0.1 by @p-linnane in https://github.com/Homebrew/brew/pull/21459
• test_bot: avoid deferring when only running dependent tests by @cho-m in https://github.com/Homebrew/brew/pull/21672
• build(deps): bump the github-actions group with 3 updates by @dependabot[bot] in https://github.com/Homebrew/brew/pull/21673
• build(deps): bump certifi from 2026.1.4 to 2026.2.25 in /Library/Homebrew/formula-analytics in the pip group across 1 directory by @dependabot[bot] in https://github.com/Homebrew/brew/pull/21674
• migrator: fix cask loads. by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/21669
• build(deps): bump the bundler group across 2 directories with 8 updates by @dependabot[bot] in https://github.com/Homebrew/brew/pull/21675
• Link versioned keg-only formulae by default by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/21676
• Add brew style --fix --todo by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/21679
• docs: reference brew generate-zap instead of external CreateZap by @p-linnane in https://github.com/Homebrew/brew/pull/21680
• Revert "Link versioned keg-only formulae by default" by @scpeters in https://github.com/Homebrew/brew/pull/21682
• docs: fix Ronn parser compatibility typo by @Rohan5commit in https://github.com/Homebrew/brew/pull/21683
• Revert "Revert "Link versioned keg-only formulae by default"" by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/21684
• github: change artifact selection order by @daeho-ro in https://github.com/Homebrew/brew/pull/21685
• bundle/installer: output "Fetching" message. by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/21686
• docs: fix MCP server test description typo by @Rohan5commit in https://github.com/Homebrew/brew/pull/21688
• Don't attempt to use the internal API for Casks by @Rylan12 in https://github.com/Homebrew/brew/pull/21667
• bump: handle simple arch-specific version bumps by @samford in https://github.com/Homebrew/brew/pull/21692
• Remove rubocop:todo from RBI files. by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/21693
• docs: fix Common Issues typo by @Rohan5commit in https://github.com/Homebrew/brew/pull/21696
• bin/brew: simplify filtering of BIN_BREW_EXPORTED_VARS by @carlocab in https://github.com/Homebrew/brew/pull/21697
• bin/brew: tighten regex for variable exclusion by @carlocab in https://github.com/Homebrew/brew/pull/21699
• formula: imply link_overwrite for related formulae by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/21689
• rubocops/move_to_extend_os: audit OS checks in extend/os by @ZhongRuoyu in https://github.com/Homebrew/brew/pull/21698
• unlink: preserve non-keg-only versioned links by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/21700
• Docs: fix duplicate word in Brewfile guide by @Rohan5commit in https://github.com/Homebrew/brew/pull/21703
• os/mac/xcode: promote Xcode 26.3 by @Bo98 in https://github.com/Homebrew/brew/pull/21701
• github/workflows: add cache-homebrew-prefix workflow keys. by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/21704
• Deprecate no_autobump! because: :requires_manual_review by @botantony in https://github.com/Homebrew/brew/pull/21550
• bump: don't error when checking casks with version :latest by @bevanjkay in https://github.com/Homebrew/brew/pull/21705
• Fix Ruby version comparison logic for 4.0+ by @hqzing in https://github.com/Homebrew/brew/pull/21706
• SkipConditions: join multiple skip messages by @rexmhall09 in https://github.com/Homebrew/brew/pull/21708
• docs: outdated macOS tools imply tier 2 by @scpeters in https://github.com/Homebrew/brew/pull/21710
• diagnostic: reword issue reporting guidelines by @scpeters in https://github.com/Homebrew/brew/pull/21711
• Json: set allow_duplicate_key in JSON.parse call by @samford in https://github.com/Homebrew/brew/pull/21709
• formulary: soften deprecation errors from FromBottleLoader by @Bo98 in https://github.com/Homebrew/brew/pull/21712
• bump: use semicolon skip messages delimiter by @samford in https://github.com/Homebrew/brew/pull/21714

New Contributors

• @stac47 made their first contribution in https://github.com/Homebrew/brew/pull/21659
• @Rohan5commit made their first contribution in https://github.com/Homebrew/brew/pull/21683
• @hqzing made their first contribution in https://github.com/Homebrew/brew/pull/21706
• @rexmhall09 made their first contribution in https://github.com/Homebrew/brew/pull/21708

Full Changelog: https://github.com/Homebrew/brew/compare/5.0.16...5.1.0