➜  ~ composer diagnose
Checking platform settings: OK
Checking git settings: OK git version 2.51.2
Checking http connectivity to packagist: OK
Checking https connectivity to packagist: OK
Checking github.com oauth access: OK does not expire
Checking disk free space: OK
Checking pubkeys:
Tags Public Key Fingerprint: 57815BA2 7E54DC31 7ECC7CC5 573090D0  87719BA6 8F3BB723 4E5D42D0 84A14642
Dev Public Key Fingerprint: 4AC45767 E5EC2265 2F0C1167 CBBB8A2B  0C708369 153E328C AD90147D AFE50952
OK
Checking Composer version: You are not running the latest stable version, run `composer self-update` to update (2.8.12 => 2.9.1)
Checking Composer and its dependencies for vulnerabilities: OK
Composer version: 2.8.12
PHP version: 8.3.27
PHP binary path: /opt/homebrew/Cellar/[email protected]/8.3.27_2/bin/php
OpenSSL version: OpenSSL 3.6.0 1 Oct 2025
curl version: 8.17.0 libz 1.2.12 brotli brotli/1.2.0 zstd supported ssl OpenSSL/3.6.0
zip: extension present, unzip present, 7-Zip not available```

composer self-update -vvv

Running 2.8.12 (2025-09-19 13:41:59) with PHP 8.3.27 on Darwin / 24.6.0
Loading config file /Users/staabm/.composer/auth.json
Reading /Users/staabm/.composer/composer.json
Loading config file /Users/staabm/.composer/auth.json
Loading config file /Users/staabm/.composer/composer.json (/Users/staabm/.composer/composer.json)
Loading config file /Users/staabm/.composer/auth.json
Reading /Users/staabm/.composer/auth.json
Checked CA file /opt/homebrew/etc/ca-certificates/cert.pem: valid
Executing command (/Users/staabm/.composer): 'git' 'branch' '-a' '--no-color' '--no-abbrev' '-v'
Executing command (/Users/staabm/.composer): 'git' 'describe' '--exact-match' '--tags'
Executing command (/Users/staabm/.composer): 'git' 'log' '--pretty=%H' '-n1' 'HEAD' '--no-show-signature'
Executing command (/Users/staabm/.composer): 'hg' 'branch'
Executing command (/Users/staabm/.composer): 'fossil' 'branch' 'list'
Executing command (/Users/staabm/.composer): 'fossil' 'tag' 'list'
Executing command (/Users/staabm/.composer): 'svn' 'info' '--xml'
Reading /Users/staabm/.composer/composer.lock
Reading /Users/staabm/.composer/vendor/composer/installed.json
Downloading https://getcomposer.org/versions
[200] https://getcomposer.org/versions
Upgrading to version 2.9.1 (stable channel).
Downloading https://getcomposer.org/download/2.9.1/composer.phar.sig
[200] https://getcomposer.org/download/2.9.1/composer.phar.sig
   Downloading https://getcomposer.org/download/2.9.1/composer.phar
[200] https://getcomposer.org/download/2.9.1/composer.phar

PHP Fatal error:  Uncaught Error: Class "Composer\Console\GithubActionError" not found in phar:///usr/local/bin/composer/src/Composer/Console/Application.php:425
Stack trace:
#0 phar:///usr/local/bin/composer/vendor/symfony/console/Application.php(171): Composer\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#1 phar:///usr/local/bin/composer/src/Composer/Console/Application.php(137): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#2 phar:///usr/local/bin/composer/bin/composer(98): Composer\Console\Application->run()
#3 /usr/local/bin/composer(29): require('phar:///usr/loc...')
#4 {main}
  thrown in phar:///usr/local/bin/composer/src/Composer/Console/Application.php on line 425