-----> Building on the Heroku-20 stack
-----> Using buildpack: heroku/php
-----> PHP app detected
-----> Bootstrapping...
-----> Installing platform packages...
 !     ERROR: Failed to install system packages!
 !     
 !     Your platform requirements (for runtimes and extensions) could
 !     not be resolved to an installable set of dependencies, or a
 !     platform package repository was unreachable.
 !     
 !     This usually means that you (or packages you are using) depend
 !     on a combination of PHP versions and/or extensions that are
 !     currently not available on Heroku.
 !     
 !     The following is the full output from the installation attempt:
 !     
 !     > You are using Composer 1 which is deprecated. You should upgrade to Composer 2, see https://blog.packagist.com/deprecating-composer-1-support/
 !     > Loading repositories with available runtimes and extensions
 !     > Updating dependencies
 !     > Your requirements could not be resolved to an installable set of packages.
 !     > 
 !     >   Problem 1
 !     >     - The requested package composer-plugin-api could not be found in any version, there may be a typo in the package name.
 !     > 
 !     
 !     For reference, the following runtimes are currently available:
 !     
 !     PHP:  8.1.1, 8.1.0, 8.0.14, 8.0.13, 8.0.12, 8.0.11, 8.0.10, 
 !     8.0.9, 8.0.8, 8.0.7, 8.0.6, 8.0.3, 8.0.2, 8.0.1, 8.0.0, 
 !     8.0.0RC4, 7.4.27, 7.4.26, 7.4.25, 7.4.24, 7.4.23, 7.4.22, 
 !     7.4.21, 7.4.20, 7.4.19, 7.4.16, 7.4.15, 7.4.14, 7.4.13, 
 !     7.4.12, 7.3.33, 7.3.32, 7.3.31, 7.3.30, 7.3.29, 7.3.28, 
 !     7.3.27, 7.3.26, 7.3.25, 7.3.24
 !     
 !     Please verify that all requirements for runtime versions in
 !     'composer.lock' are compatible with the list above, and ensure
 !     all required extensions are available for the desired runtimes.
 !     
 !     When choosing a PHP runtimes and extensions, please also ensure
 !     they are available on your app's stack (heroku-20), and select
 !     a different stack if needed after consulting the article below.
 !     
 !     For a list of supported runtimes & extensions on Heroku, please
 !     refer to: https://devcenter.heroku.com/articles/php-support
 !     Push rejected, failed to compile PHP app.
 !     Push failed

Coeds above are the error I am getting when I deploy the app, the app runs perfectly fine locally, I am not sure what happened during the deployment.

composer.json

{
    "name": "laravel/laravel",
    "type": "project",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "require": {
        "php": "^8.1.1",
        "composer-plugin-api": "^2.2",
        "dcat/laravel-admin": "^1.7",
        "fruitcake/laravel-cors": "^2.0",
        "guzzlehttp/guzzle": "^7.0.1",
        "laravel/framework": "^8.75",
        "laravel/sanctum": "^2.11",
        "laravel/tinker": "^2.5"
    },
    "require-dev": {
        "facade/ignition": "^2.5",
        "fakerphp/faker": "^1.9.1",
        "laravel/sail": "^1.0.1",
        "mockery/mockery": "^1.4.4",
        "nunomaduro/collision": "^5.10",
        "phpunit/phpunit": "^9.5.10",
        "composer/composer": "^2.0"
    },
    "autoload": {
        "psr-4": {
            "App\\": "app/",
            "Database\\Factories\\": "database/factories/",
            "Database\\Seeders\\": "database/seeders/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Tests\\": "tests/"
        }
    },
    "scripts": {
        "post-autoload-dump": [
            "Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
            "@php artisan package:discover --ansi"
        ],
        "post-update-cmd": [
            "@php artisan vendor:publish --tag=laravel-assets --ansi --force"
        ],
        "post-root-package-install": [
            "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "@php artisan key:generate --ansi"
        ]
    },
    "extra": {
        "laravel": {
            "dont-discover": []
        }
    },
    "config": {
        "optimize-autoloader": true,
        "preferred-install": "dist",
        "sort-packages": true
    },
    "minimum-stability": "dev",
    "prefer-stable": true
}

Error 1

The requested package composer-plugin-api could not be found in any version, there may be a typo in the package name.

Error 2

I am using Composer version 2.2.1, why it shows that i am using composer 1 during the deployment?

Error 3

In the composer.json file, I have required PHP 8.1.1, why does it still say that I am not using the correct version?

CodePudding user response：

It looks like the Heroku server your are using for deploying your application does not support the composer version used locally. As you are using heroku-20, make sure you use Composer 1.10.* or 2.1.*

My assumption is that you updated Composer to 2.2.x which may not be supported at the moment. You should downgrade to Composer 2.1.14 then run composer update again.

composer self-update --rollback
composer -v # Should be 2.1.14
composer update