MacOS Tahoe 26.2 Error

[VantaGate]

Output of brew config

/Users/digitalmaster/brew/Library/Homebrew/macos_version.rb:53:in 'MacOSVersion#initialize': unknown or unsupported macOS version: "26.2" (MacOSVersion::Error)
	from /Users/digitalmaster/brew/Library/Homebrew/os/mac.rb:44:in 'Class#new'
	from /Users/digitalmaster/brew/Library/Homebrew/os/mac.rb:44:in 'OS::Mac.full_version'
	from /Users/digitalmaster/brew/Library/Homebrew/os/mac.rb:32:in 'OS::Mac.version'
	from /Users/digitalmaster/brew/Library/Homebrew/os.rb:60:in '<module:OS>'
	from /Users/digitalmaster/brew/Library/Homebrew/os.rb:7:in '<main>'
	from <internal:/Users/digitalmaster/brew/Library/Homebrew/vendor/portable-ruby/3.4.3/lib/ruby/3.4.0/rubygems/core_ext/kernel_require.rb>:37:in 'Kernel#require'
	from <internal:/Users/digitalmaster/brew/Library/Homebrew/vendor/portable-ruby/3.4.3/lib/ruby/3.4.0/rubygems/core_ext/kernel_require.rb>:37:in 'Kernel#require'
	from /Users/digitalmaster/brew/Library/Homebrew/vendor/portable-ruby/3.4.3/lib/ruby/gems/3.4.0/gems/bootsnap-1.18.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in 'Kernel#require'
	from /Users/digitalmaster/brew/Library/Homebrew/global.rb:138:in '<top (required)>'
	from /Users/digitalmaster/brew/Library/Homebrew/brew.rb:18:in 'Kernel#require_relative'
	from /Users/digitalmaster/brew/Library/Homebrew/brew.rb:18:in '<main>'

Output of brew doctor

/Users/digitalmaster/brew/Library/Homebrew/macos_version.rb:53:in 'MacOSVersion#initialize': unknown or unsupported macOS version: "26.2" (MacOSVersion::Error)
	from /Users/digitalmaster/brew/Library/Homebrew/os/mac.rb:44:in 'Class#new'
	from /Users/digitalmaster/brew/Library/Homebrew/os/mac.rb:44:in 'OS::Mac.full_version'
	from /Users/digitalmaster/brew/Library/Homebrew/os/mac.rb:32:in 'OS::Mac.version'
	from /Users/digitalmaster/brew/Library/Homebrew/os.rb:60:in '<module:OS>'
	from /Users/digitalmaster/brew/Library/Homebrew/os.rb:7:in '<main>'
	from <internal:/Users/digitalmaster/brew/Library/Homebrew/vendor/portable-ruby/3.4.3/lib/ruby/3.4.0/rubygems/core_ext/kernel_require.rb>:37:in 'Kernel#require'
	from <internal:/Users/digitalmaster/brew/Library/Homebrew/vendor/portable-ruby/3.4.3/lib/ruby/3.4.0/rubygems/core_ext/kernel_require.rb>:37:in 'Kernel#require'
	from /Users/digitalmaster/brew/Library/Homebrew/vendor/portable-ruby/3.4.3/lib/ruby/gems/3.4.0/gems/bootsnap-1.18.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in 'Kernel#require'
	from /Users/digitalmaster/brew/Library/Homebrew/global.rb:138:in '<top (required)>'
	from /Users/digitalmaster/brew/Library/Homebrew/brew.rb:18:in 'Kernel#require_relative'
	from /Users/digitalmaster/brew/Library/Homebrew/brew.rb:18:in '<main>'

Description of issue

I looked at another similar discussion here, but the terminal still returned errors for me. I tried executing each command separately at first:
User input: digitalmaster@Macmini ~ % brew update-reset
Terminal output:

==> Fetching /Users/digitalmaster/brew...
remote: Enumerating objects: 1396, done.
remote: Counting objects: 100% (791/791), done.
remote: Compressing objects: 100% (75/75), done.
remote: Total 1396 (delta 745), reused 719 (delta 716), pack-reused 605 (from 3)
Receiving objects: 100% (1396/1396), 808.66 KiB | 4.15 MiB/s, done.
Resolving deltas: 100% (849/849), completed with 199 local objects.
From https://github.com/Homebrew/brew
 + d406a6807e...97344fc401 brew-doctor-check-mirrors   -> origin/brew-doctor-check-mirrors  (forced update)
 * [new branch]            copilot/implement-discussed-features -> origin/copilot/implement-discussed-features
 * [new branch]            deprecate_disable_delete    -> origin/deprecate_disable_delete
 * [new branch]            fix-services-internal-api   -> origin/fix-services-internal-api
 * [new branch]            fix/test-bot-homebrew-repository-to-s -> origin/fix/test-bot-homebrew-repository-to-s
 * [new branch]            fix/test-bot-re-checkout-after-cache-restore -> origin/fix/test-bot-re-checkout-after-cache-restore
   7788a02932..f0057b6c28  main                        -> origin/main
   7788a02932..f0057b6c28  master                      -> origin/master
 * [new branch]            no_autobump-audit-on-version-bump -> origin/no_autobump-audit-on-version-bump
 + 68dd98619f...7222f3ea01 portable-ruby-4.0.1         -> origin/portable-ruby-4.0.1  (forced update)
 * [new branch]            resource-autobump           -> origin/resource-autobump
 * [new branch]            skip-intel-unless-exact-tag -> origin/skip-intel-unless-exact-tag
 * [new branch]            strict-typing-rubocops      -> origin/strict-typing-rubocops
 * [new branch]            strict-typing-test-bot      -> origin/strict-typing-test-bot
 * [new tag]               5.0.14                      -> 5.0.14
 * [new tag]               5.0.15                      -> 5.0.15

==> Resetting /Users/digitalmaster/brew...
Reset branch 'stable'

User input:
digitalmaster@Macmini ~ % brew config
Terminal output:

/Users/digitalmaster/brew/Library/Homebrew/macos_version.rb:53:in 'MacOSVersion#initialize': unknown or unsupported macOS version: "26.2" (MacOSVersion::Error)
	from /Users/digitalmaster/brew/Library/Homebrew/os/mac.rb:44:in 'Class#new'
	from /Users/digitalmaster/brew/Library/Homebrew/os/mac.rb:44:in 'OS::Mac.full_version'
	from /Users/digitalmaster/brew/Library/Homebrew/os/mac.rb:32:in 'OS::Mac.version'
	from /Users/digitalmaster/brew/Library/Homebrew/os.rb:60:in '<module:OS>'
	from /Users/digitalmaster/brew/Library/Homebrew/os.rb:7:in '<main>'
	from <internal:/Users/digitalmaster/brew/Library/Homebrew/vendor/portable-ruby/3.4.3/lib/ruby/3.4.0/rubygems/core_ext/kernel_require.rb>:37:in 'Kernel#require'
	from <internal:/Users/digitalmaster/brew/Library/Homebrew/vendor/portable-ruby/3.4.3/lib/ruby/3.4.0/rubygems/core_ext/kernel_require.rb>:37:in 'Kernel#require'
	from /Users/digitalmaster/brew/Library/Homebrew/vendor/portable-ruby/3.4.3/lib/ruby/gems/3.4.0/gems/bootsnap-1.18.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in 'Kernel#require'
	from /Users/digitalmaster/brew/Library/Homebrew/global.rb:138:in '<top (required)>'
	from /Users/digitalmaster/brew/Library/Homebrew/brew.rb:18:in 'Kernel#require_relative'
	from /Users/digitalmaster/brew/Library/Homebrew/brew.rb:18:in '<main>'

User input:
digitalmaster@Macmini ~ % brew doctor
Terminal output:

/Users/digitalmaster/brew/Library/Homebrew/macos_version.rb:53:in 'MacOSVersion#initialize': unknown or unsupported macOS version: "26.2" (MacOSVersion::Error)
	from /Users/digitalmaster/brew/Library/Homebrew/os/mac.rb:44:in 'Class#new'
	from /Users/digitalmaster/brew/Library/Homebrew/os/mac.rb:44:in 'OS::Mac.full_version'
	from /Users/digitalmaster/brew/Library/Homebrew/os/mac.rb:32:in 'OS::Mac.version'
	from /Users/digitalmaster/brew/Library/Homebrew/os.rb:60:in '<module:OS>'
	from /Users/digitalmaster/brew/Library/Homebrew/os.rb:7:in '<main>'
	from <internal:/Users/digitalmaster/brew/Library/Homebrew/vendor/portable-ruby/3.4.3/lib/ruby/3.4.0/rubygems/core_ext/kernel_require.rb>:37:in 'Kernel#require'
	from <internal:/Users/digitalmaster/brew/Library/Homebrew/vendor/portable-ruby/3.4.3/lib/ruby/3.4.0/rubygems/core_ext/kernel_require.rb>:37:in 'Kernel#require'
	from /Users/digitalmaster/brew/Library/Homebrew/vendor/portable-ruby/3.4.3/lib/ruby/gems/3.4.0/gems/bootsnap-1.18.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in 'Kernel#require'
	from /Users/digitalmaster/brew/Library/Homebrew/global.rb:138:in '<top (required)>'
	from /Users/digitalmaster/brew/Library/Homebrew/brew.rb:18:in 'Kernel#require_relative'
	from /Users/digitalmaster/brew/Library/Homebrew/brew.rb:18:in '<main>'

I then tried to execute all of them at once:
digitalmaster@Macmini ~ % brew update-reset && brew config && brew doctor

==> Fetching /Users/digitalmaster/brew...

==> Resetting /Users/digitalmaster/brew...
Reset branch 'stable'

/Users/digitalmaster/brew/Library/Homebrew/macos_version.rb:53:in 'MacOSVersion#initialize': unknown or unsupported macOS version: "26.2" (MacOSVersion::Error)
	from /Users/digitalmaster/brew/Library/Homebrew/os/mac.rb:44:in 'Class#new'
	from /Users/digitalmaster/brew/Library/Homebrew/os/mac.rb:44:in 'OS::Mac.full_version'
	from /Users/digitalmaster/brew/Library/Homebrew/os/mac.rb:32:in 'OS::Mac.version'
	from /Users/digitalmaster/brew/Library/Homebrew/os.rb:60:in '<module:OS>'
	from /Users/digitalmaster/brew/Library/Homebrew/os.rb:7:in '<main>'
	from <internal:/Users/digitalmaster/brew/Library/Homebrew/vendor/portable-ruby/3.4.3/lib/ruby/3.4.0/rubygems/core_ext/kernel_require.rb>:37:in 'Kernel#require'
	from <internal:/Users/digitalmaster/brew/Library/Homebrew/vendor/portable-ruby/3.4.3/lib/ruby/3.4.0/rubygems/core_ext/kernel_require.rb>:37:in 'Kernel#require'
	from /Users/digitalmaster/brew/Library/Homebrew/vendor/portable-ruby/3.4.3/lib/ruby/gems/3.4.0/gems/bootsnap-1.18.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in 'Kernel#require'
	from /Users/digitalmaster/brew/Library/Homebrew/global.rb:138:in '<top (required)>'
	from /Users/digitalmaster/brew/Library/Homebrew/brew.rb:18:in 'Kernel#require_relative'
	from /Users/digitalmaster/brew/Library/Homebrew/brew.rb:18:in '<main>' 

..but it still returned the same errors. What am I doing wrong? It could be right in front of me but I'm not that great at troubleshooting homebrew. Any advice would be appreciated!

[armaan-71]

The error is happening because Homebrew doesn’t recognize macOS version 26.2 yet.

Your installed Homebrew version likely predates support for 26.x, so it fails when parsing the OS version.

You’ll need to update to a Homebrew version that includes support for macOS 26, or reinstall Homebrew cleanly if updating doesn’t resolve it.

[SMillerDev]

You’ll need to update to a Homebrew version that includes support for macOS 26, or reinstall Homebrew cleanly if updating doesn’t resolve it.

That's what the update-reset they ran does

[SMillerDev]

What does git -C status $(brew --repo) say?

[p-linnane]

You're on an unsupported configuration because you aren't using the default prefix of /opt/homebrew. I noticed you're also on Portable Ruby 3.4.3 when the latest is 3.4.8, so you've somehow gotten stuck on an older commit. Try running git -C $(brew --repo) status like @SMillerDev said.