Release notes for this release can be found on the Homebrew blog.

What's Changed

• workflows/tests: update homebrew/core in audit tests. by @MikeMcQuaid in #20321
• Fix type error in Readall.valid_tap? by @dduugg in #20319
• workflows/vendor-gems: push to PRs from dependabot. by @MikeMcQuaid in #20322
• Reduce shape variations in Homebrew::Service by @dduugg in #20324
• workflows/tests: set HOMEBREW_DOWNLOAD_CONCURRENCY for test-bot tests. by @MikeMcQuaid in #20297
• env_config: add auto option for download_concurrency by @MikeMcQuaid in #20329
• formula*: add source download support for download queue. by @MikeMcQuaid in #20327
• cmd/info: don't print empty caveats. by @MikeMcQuaid in #20330
• Add Cask install/upgrade/reinstall support for download queue by @MikeMcQuaid in #20328
• Enable strict typing in Cask::Audit by @dduugg in #20325
• brew upgrade --help missing HOMEBREW_UPGRADE_GREEDY by @agowa in #20333
• utils/gems: use Homebrew-specific gem spec cache by @Bo98 in #20340
• api: fix handling of source downloads by @Bo98 in #20341
• Deprecate/disable/remove code for Homebrew 4.6 by @MikeMcQuaid in #20331
• Document HOMEBREW_DOWNLOAD_CONCURRENCY environment variable by @MikeMcQuaid in #20342
• Fix URI parser warning by @MikeMcQuaid in #20343
• Cleanup some extend/* types/locations by @MikeMcQuaid in #20344
• formula_assertions: fix typechecking error in {shell,pipe}_output by @carlocab in #20345
• extend/kernel: fix odisabled call. by @MikeMcQuaid in #20349
• extend/pathname: fix type signature for write_env_script. by @MikeMcQuaid in #20351
• observer_pathname_extension: add strict Sorbet types. by @MikeMcQuaid in #20354
• download_queue: fix patch handling. by @MikeMcQuaid in #20353
• utils/curl.rb: Skip https audit for curl dependencies by @osalbahr in #20348
• dev-cmd/cat: add require "formula" by @carlocab in #20355
• extend/kernel: tighten up some type signatures by @carlocab in #20356
• extend/kernel: tighten type sig for ensure_formula_installed! by @carlocab in #20357
• Ensure we require "formula" before doing ensure_formula_installed! by @carlocab in #20358
• Replace ensure_formula_installed! with Formula#ensure_installed! by @carlocab in #20359
• Manpage: source wording & formatting fixes by @EricFromCanada in #20361
• Formula-Cookbook: Recommend the in-use write_exec_script syntax by @issyl0 in #20363
• pathname: add type to write_exec_script by @daeho-ro in #20365
• extend/kernel: allow exec_editor to open multiple files at once by @bayandin in #20367
• SkipConditions: special case unsigned deprecations by @samford in #20366
• output: express environment variables consistently by @EricFromCanada in #20364
• cmd/update: use short option in update.sh by @chirsz-ever in #20368
• Improve Download Queue output by @MikeMcQuaid in #20370
• extend/kernel: remove ensure_formula_installed! by @MikeMcQuaid in #20371
• Enable strict typing in Tap by @dduugg in #20369

New Contributors

• @agowa made their first contribution in #20333
• @chirsz-ever made their first contribution in #20368

Full Changelog: 4.5.13...4.6.0

What's Changed

• cask/audit: refine codesign audits by @bevanjkay in #20300
• tap: continue to autobump deprecated unsigned casks by @bevanjkay in #20299
• Add Copilot instructions and setup steps by @MikeMcQuaid in #20301
• Optionally use DownloadQueue for reinstall, upgrade. by @MikeMcQuaid in #20296
• cask/audit: use gktool for signing audit by @bevanjkay in #20303
• cmd/search: --desc depends on --eval-all, not the other way around by @issyl0 in #20305
• Fix forbidding special license refs by @Bo98 in #20306
• Improve error message for tap conflicts in brew install by @Copilot in #20304
• cask/audit: skip signing audit without gktool by @bevanjkay in #20307
• attestation: improve debug message. by @MikeMcQuaid in #20310
• Make --debug output a bit quieter by default by @MikeMcQuaid in #20311
• linux/development_tools: add undocumented environment variables. by @MikeMcQuaid in #20312
• download_queue: improve non-TTY output. by @MikeMcQuaid in #20313
• Bump the "all" group with 3 updates across multiple ecosystems by @dependabot[bot] in #20309

New Contributors

• @Copilot made their first contribution in #20304

Full Changelog: 4.5.12...4.5.13

What's Changed

• retryable_download: retry on bottle manifest errors. by @MikeMcQuaid in #20288
• cask/audit: always enable codesign audit by @bevanjkay in #20286
• Add JSON API download strategy for download queue by @MikeMcQuaid in #20289
• cask/audit: skip signing audit for shell scripts by @bevanjkay in #20292
• Bump thor from 1.3.2 to 1.4.0 to resolve dependabot alert by @dduugg in #20293
• Fix handling of formula install blocking by @Bo98 in #20298

Full Changelog: 4.5.11...4.5.12

What's Changed

• Move more logic from cmd/fetch to download_queue by @MikeMcQuaid in #20241
• build(deps): bump the dependabot group across 1 directory with 25 updates by @dependabot[bot] in #20244
• feat: add update-perl-resources dev-cmd by @daeho-ro in #20218
• Bump the "all" group with 1 updates across multiple ecosystems by @dependabot[bot] in #20253
• cleanup: don't warn when loading a renamed cask. by @MikeMcQuaid in #20256
• Add docs for brew alias command by @EricFromCanada in #20260
• Ignore IP allow list errors in too_many_open_prs by @MTCoster in #20263
• utils/pypi: ensure pure Python wheels support py3 by @dtrodrigues in #19984
• Portable Ruby 3.4.5 by @p-linnane in #20265
• github_runner_matrix: note about adding OS tags. by @MikeMcQuaid in #20266
• test/fixtures: add minimal mp4 by @bevanjkay in #20262
• Audit no_autobump! reason for new packages by @botantony in #20267
• ask option refactoring by @tyuwags in #20274
• Refactor DownloadQueue handling by @MikeMcQuaid in #20272
• formulary: make no_autobump! reason a symbol when needed by @botantony in #20270
• bundle: --file and --global should conflict by @gromgit in #20276
• Optionally use download_queue for brew install by @MikeMcQuaid in #20245
• Optionally parallelise API file downloads by @MikeMcQuaid in #20273
• docs: add Homebrew's MCP server documentation. by @MikeMcQuaid in #20277
• Bump the "all" group with 3 updates across multiple ecosystems by @dependabot[bot] in #20275
• formula_installer: ignore bottle_tab_runtime_dependencies errors by @Bo98 in #20282
• dispatch-build-bottle: use main branch by @carlocab in #20284
• env_script_all_files: don't overwrite existing stuff by @gromgit in #20281
• Fix some stdout issues with concurrence by @Rylan12 in #20283
• Improve Download Queue behaviour by @MikeMcQuaid in #20285

New Contributors

• @MTCoster made their first contribution in #20263

Full Changelog: 4.5.10...4.5.11

What's Changed

• Rename the brew_{dumper,installer}_spec.rb files by @issyl0 in #20225
• attestation: require explicit opt-in. by @MikeMcQuaid in #20229
• Replace github.token by secrets.GITHUB_TOKEN by @Paulchen5 in #20228
• formulary: prevent formulae from printing to stdout while being loaded by @carlocab in #20226
• Support Cask renames when installing/dumping by @MikeMcQuaid in #20224
• Improve some Pathname instance variable handling by @MikeMcQuaid in #20232
• Add ZeroZeroZeroZero cop by @MikeMcQuaid in #20233
• rubocops/text: Prefer lib/"string" over lib+"string" by @issyl0 in #20235
• style: fix skipping actionlint checks on Homebrew/brew. by @MikeMcQuaid in #20237
• fixtures/rubocop@x.x.x.rbi: fix style. by @MikeMcQuaid in #20238
• build(deps): bump setuptools from 80.8.0 to 80.9.0 in /Library/Homebrew/formula-analytics by @dependabot[bot] in #20243
• build(deps): bump the dependabot group across 1 directory with 3 updates by @dependabot[bot] in #20242
• aliases/aliases: fix naming of symlinks by @EricFromCanada in #20246

New Contributors

• @Paulchen5 made their first contribution in #20228

Full Changelog: 4.5.9...4.5.10

What's Changed

• audit: ensure that official formula and cask names don't conflict. by @MikeMcQuaid in #20134
• mcp_server: fix EOF handling. by @MikeMcQuaid in #20160
• Remove redundant xattr doctor check on systems without quarantine support by @Rylan12 in #20163
• Switch to using main as the default branch by @MikeMcQuaid in #20164
• workflows/sync-default-branches: force push instead of force-with-lease. by @MikeMcQuaid in #20166
• package/scripts/postinstall: add Homebrew to PATH. by @MikeMcQuaid in #20159
• tab, cask/tab: add more Sorbet types and signatures. by @MikeMcQuaid in #20165
• cmd/update-report: display descriptions for new formulae and casks. by @MikeMcQuaid in #20167
• download_strategy: Add logging when a cached download is being ignored by @boblail in #20169
• updating json with cask/migrator by @tyuwags in #20168
• docs: add autobump related documentation by @botantony in #20117
• cli/named_args: don't warn about old tokens overlapping. by @MikeMcQuaid in #20173
• docs: homebrew-cask's default branch is now main by @MikeMcQuaid in #20172
• Refine ask‐option dependency resolution and strengthen tests by @tyuwags in #20033
• create: detect URL from latest release if it isn't archive by @abitrolly in #20156
• cmd/update: improve Homebrew/brew and homebrew-cask main migration. by @MikeMcQuaid in #20175
• cask/installer: remove migration symlinks on uninstall by @EricFromCanada in #20174
• upgrade pin nil value by @tyuwags in #20178
• docs: fix HTML Proofer in CI by @MikeMcQuaid in #20184
• Correcting refine ask option dependency by @tyuwags in #20183
• docs: homebrew-core's default branch is now main by @MikeMcQuaid in #20171
• cmd/update: improve homebrew-core main migration. by @MikeMcQuaid in #20176
• Provide more leeway to file Tier 2/3 issues. by @MikeMcQuaid in #20185
• cmd/update: ensure we update remote main ref by @Bo98 in #20186
• Reapply "Make some of the bundle commands Sorbet typed: true" by @issyl0 in #20182
• cmd/update: ensure local branch moves to main by @Bo98 in #20190
• dev-cmd/bump-formula-pr: release notes as proper html link by @stefanb in #20187
• extend/ENV/super: set MATURIN_NO_INSTALL_RUST by @branchvincent in #20191
• Refactor exec.rb type fixes by @dduugg in #20192
• Make the remaining bundle files typed: true by @issyl0 in #20128
• github_runner_matrix: fix skipped runner creation by @EricFromCanada in #20198
• Fix "undefined method 'name' for an instance of FormulaInstaller" by @issyl0 in #20201
• Ask option refactoring by @tyuwags in #20195
• download_strategy: preserve cache upon text response by @EricFromCanada in #20200
• cmd/dev-cmd: fetch HOMEBREW_EVAL_ALL for --eval-all by @EricFromCanada in #20204
• cmd/info: fix brew info <formula> by @EricFromCanada in #20211
• docs/Homebrew-on-Linux: update dnf5 syntax, centos/rhel section by @osalbahr in #20206
• Formula-Cookbook: improve download strategy info by @EricFromCanada in #20210
• bundle: Rename "brews" to "formulae" for consistency by @issyl0 in #20209
• Retain the old brew bundle --brews flag for compatibility by @issyl0 in #20214
• Exit non-zero when pinning uninstalled formula by @dduugg in #20213
• Keep only the parts of rubocop.rbi that we actually use by @issyl0 in #20193
• style: run shfmt on real brew by @Bo98 in #20221
• download_strategy: only require content-disposition header by @EricFromCanada in #20220

New Contributors

• @stefanb made their first contribution in #20187

Full Changelog: 4.5.8...4.5.9

What's Changed

• Add HOMEBREW_MACOS_NEWEST_SUPPORTED env var by @samford in #20112
• Replace hardlinks with symlinks for brew tests by @abitrolly in #20115
• MacOSVersion: enable strong typing, expand tests by @samford in #20108
• Remove alias generic_* definitions in favour of using super by @MikeMcQuaid in #20120
• Remove vale FIXME by @abitrolly in #20123
• a*.rb: move to strict Sorbet sigil. by @MikeMcQuaid in #20121
• Add Cask::Config RBI compiler by @samford in #20124
• cask/audit: also check binary for minimum OS by @EricFromCanada in #20119
• cask: move some files to strict Sorbet sigil. by @MikeMcQuaid in #20125
• utils/github/api: fix Sorbet types. by @MikeMcQuaid in #20129
• Refactor FormulaCreator args and call parse_url automatically by @abitrolly in #20116
• cmd: set typed: strict by @MikeMcQuaid in #20130
• debrew: set typed: strict by @MikeMcQuaid in #20131
• dev-cmd: set typed: strict by @MikeMcQuaid in #20132
• requirements: set typed: strict by @MikeMcQuaid in #20133
• Fix type mismatch in brew info by @Rylan12 in #20139
• cask/installer: remove confusing zap messaging by @p-linnane in #20138
• download_strategy: fix caching of :latest downloads by @EricFromCanada in #20137
• formula_creator: test GitHub repo call for archive|releases URLs by @abitrolly in #20136
• rubocops: add no_autobump! rubocop by @botantony in #20126
• tap: rely on new autobump list by @botantony in #20141
• formula_creator: detect GitHub version from latest release by @abitrolly in #20025
• rubocops/caveats: check for dynamic caveats. by @MikeMcQuaid in #20135
• Make some of the bundle commands Sorbet typed: true by @issyl0 in #20145
• Fix handling of class methods in extend/os by @Rylan12 in #20152
• Fix brew doctor cask handling on Linux by @Rylan12 in #20151
• download_strategy: fossil now outputs hash: by @EricFromCanada in #20150
• create: strip 'v' prefix from version by @abitrolly in #20154
• Improve brew doctor warnings about xattr and cask quarantine by @Rylan12 in #20153
• rubocops/caveats: only apply dynamic logic check to core. by @MikeMcQuaid in #20155
• language/*: fix *_SHEBANG_REGEX anchors by @carlocab in #20157
• Revert "Make some of the bundle commands Sorbet typed: true" by @MikeMcQuaid in #20158

Full Changelog: 4.5.7...4.5.8

What's Changed

• tests: default to API mode enabled. by @MikeMcQuaid in #20070
• cmd/deps: add warning when not using runtime dependencies. by @MikeMcQuaid in #20071
• dev-cmd/contributions: improve CSV output. by @MikeMcQuaid in #20074
• rubocops/cask/no_overrides: avoid nested depends_on macos: by @EricFromCanada in #20075
• cmd/update: attempt migration from master to main branch. by @MikeMcQuaid in #20073
• Tweak GitHub Actions workflows by @MikeMcQuaid in #20077
• Filter brew tests spec files appropriately for each OS by @Rylan12 in #20079
• cask/audit: skip caveats check for Intel-only casks by @EricFromCanada in #20081
• dev-cmd/bump-formula-pr: handle null body by @Bo98 in #20087
• Only generate cask variations for supported macOS configurations by @Rylan12 in #20080
• Add strict parameter to GitHub::check_for_duplicate_pull_requests by @alex in #20082
• Remove unused --force-auto-update option by @Lekensteyn in #20090
• Revert "Filter brew tests spec files appropriately for each OS" by @MikeMcQuaid in #20089
• Generate template API samples for formulae.brew.sh docs workflow by @Rylan12 in #20091
• Revert "Only generate cask variations for supported macOS configurations" by @Rylan12 in #20092
• Add MCP server VS Code config by @p-linnane in #20093
• Remove deprecated vscode sorbet option by @Rylan12 in #20094
• Fix vscode ruby-lsp setup for GitHub codespaces by @Rylan12 in #20095
• Cask: Initialize yet more instance variables by @samford in #20100
• Use Homebrew/actions/*@main in Actions workflows by @MikeMcQuaid in #20101
• Add sync-default-branches workflow by @MikeMcQuaid in #20103
• Hide main branches from brew tap-info and brew info by @MikeMcQuaid in #20098
• cmd/update*: more fixes to allow migration from master to main. by @MikeMcQuaid in #20099
• Open issues for failed scheduled workflows by @MikeMcQuaid in #20107
• api_hashable: retain access to global gitconfig by @Bo98 in #20110

New Contributors

• @alex made their first contribution in #20082

Full Changelog: 4.5.6...4.5.7

This release contains preliminary macOS 26 Tahoe support. When using macOS 26 betas, remember that:

• You must also update Xcode and the CLT to 26.0 beta
• brew install will default to Sequoia bottles until closer to release, so formulae like pkg-config, gcc and llvm will use the macOS 15 SDK when installed from a bottle and may not work correctly
• Formulae built from source may or may not work depending on whether upstreams support macOS/Xcode 26 yet

What's Changed

• Preliminary macOS 26 (Tahoe) support by @Bo98 in #20062
• cmd/vendor-install: fix exit code handling for curl by @Bo98 in #20063
• Reduce Homebrew/brew CI warnings by @MikeMcQuaid in #20054
• workflows/tests.yml: more CI tweaks. by @MikeMcQuaid in #20060
• Cleanup extend/ directory usage. by @MikeMcQuaid in #20061

Full Changelog: 4.5.5...4.5.6

What's Changed

• audits: quote and reword problem description text by @EricFromCanada in #20030
• brew.sh: move sudo reset timestamp. by @MikeMcQuaid in #20037
• Shard JSON API by OS/Arch combination by @Rylan12 in #20038
• test/cmd: add more shell tests. by @MikeMcQuaid in #20040
• Refactor OnSystem and SimulateSystem bottle tag handling by @Rylan12 in #20042
• parser: show related environment variable in switch description by @EricFromCanada in #20044
• Add brew mcp-server: a MCP server for Homebrew. by @MikeMcQuaid in #20041
• Fix sharded API structure to match existing API by @Rylan12 in #20045
• os/mac/pkgconfig/15: update expat version to 2.7.1 by @Rylan12 in #20048
• Add undocumented HOMEBREW_USE_INTERNAL_API switch by @Rylan12 in #20046
• bin/brew: don't copy across zeroed env values. by @MikeMcQuaid in #20053
• brew (bundle|) sh: use user's configuration but override prompts. by @MikeMcQuaid in #20047
• rubocops/cask/url: put keyword parameters on a new line by @EricFromCanada in #20055
• cask_loader: improve error handling. by @MikeMcQuaid in #20057
• Reduce the internal formula API to contain the bare minimum data by @Rylan12 in #20051
• Improve completions (and elisp) output in caveats by @MikeMcQuaid in #20059

Full Changelog: 4.5.4...4.5.5