How to fix version incompatibility when installing laravel/fortify?

Question

Composer

Hello everyone, I'm trying to install laravel/fortify.
Errors are displayed, how do I resolve version inconsistencies?

composer.json

{
    "name": "laravel/laravel",
    "type": "project",
    "description": "The Laravel Framework.",
    "keywords": [
        "framework",
        "laravel"
    ],
    "license": "MIT",
    "require": {
        "php": "^7.1.3",
        "fideloper/proxy": "^4.0",
        "laravel/framework": "5.8.*",
        "laravel/tinker": "^1.0"
    },
    "require-dev": {
        "beyondcode/laravel-dump-server": "^1.0",
        "filp/whoops": "^2.0",
        "fzaninotto/faker": "^1.4",
        "mockery/mockery": "^1.0",
        "nunomaduro/collision": "^3.0",
        "phpunit/phpunit": "^7.5"
    },
    "config": {
        "optimize-autoloader": true,
        "preferred-install": "dist",
        "sort-packages": true
    },
    "extra": {
        "laravel": {
            "dont-discover": []
        }
    },
    "autoload": {
        "psr-4": {
            "App\\": "app/",
            "Database\\": "database/"
        },
        "classmap": [
            "database/seeds",
            "database/factories"
        ]
    },
    "autoload-dev": {
        "psr-4": {
            "Tests\\": "tests/"
        }
    },
    "minimum-stability": "dev",
    "prefer-stable": true,
    "scripts": {
        "post-autoload-dump": [
            "Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
            "@php artisan package:discover --ansi"
        ],
        "post-root-package-install": [
            "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "@php artisan key:generate --ansi"
        ]
    }
}

Error while executing `composer require laravel/fortify`

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Conclusion: don't install laravel/fortify v1.7.12
    - Conclusion: don't install laravel/fortify v1.7.11
    - Conclusion: don't install laravel/fortify v1.7.10
    - Conclusion: don't install laravel/fortify v1.7.9
    - Conclusion: don't install laravel/fortify v1.7.8
    - Conclusion: don't install laravel/fortify v1.7.7
    - Conclusion: don't install laravel/fortify v1.7.6
    - Conclusion: don't install laravel/fortify v1.7.5
    - Conclusion: don't install laravel/fortify v1.7.4
    - Conclusion: don't install laravel/fortify v1.7.3
    - Conclusion: don't install laravel/fortify v1.7.2
    - Conclusion: don't install laravel/fortify v1.7.1
    - Conclusion: don't install laravel/fortify v1.7.0
    - Conclusion: remove laravel/framework v5.8.38
    - Installation request for laravel/fortify ^1.7 -> satisfiable by laravel/fortify[1.x-dev, v1.7.0, v1.7.1, v1.7.10, v1.7.11, v1.7.12, v1.7.2, v1.7.3, v1.7.4, v1.7.5, v1.7.6, v1.7.7, v1.7.8, v1.7.9].
    - Conclusion: don't install laravel/framework v5.8.38
    - laravel/fortify 1.x-dev requires illuminate/support ^8.0 -> satisfiable by illuminate/support[8.x-dev, v8.0.0, v8.0.1, v8.0.2, v8.0.3, v8.0.4, v8.1.0, v8.10.0, v8.11.0, v8.11.1, v8.11.2, v8.12.0, v8.12.1, v8.12.2, v8.12.3, v8.13.0, v8.14.0, v8.15.0, v8.16.0, v8.16.1, v8.17.0, v8.17.2, v8.18.0, v8.18.1, v8.19.0, v8.2.0, v8.20.0, v8.20.1, v8.21.0, v8.22.0, v8.22.1, v8.23.1, v8.24.0, v8.25.0, v8.26.0, v8.26.1, v8.27.0, v8.28.0, v8.28.1, v8.29.0, v8.3.0, v8.30.0, v8.30.1, v8.31.0, v8.32.0, v8.32.1, v8.33.0, v8.33.1, v8.34.0, v8.35.0, v8.35.1, v8.36.0, v8.36.1, v8.36.2, v8.37.0, v8.38.0, v8.39.0, v8.4.0, v8.40.0, v8.5.0, v8.6.0, v8.7.0, v8.7.1, v8.8.0, v8.9.0].
    - don't install illuminate/support 8.x-dev|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.0.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.0.1|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.0.2|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.0.3|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.0.4|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.1.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.10.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.11.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.11.1|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.11.2|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.12.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.12.1|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.12.2|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.12.3|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.13.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.14.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.15.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.16.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.16.1|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.17.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.17.2|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.18.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.18.1|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.19.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.2.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.20.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.20.1|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.21.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.22.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.22.1|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.23.1|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.24.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.25.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.26.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.26.1|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.27.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.28.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.28.1|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.29.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.3.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.30.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.30.1|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.31.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.32.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.32.1|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.33.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.33.1|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.34.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.35.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.35.1|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.36.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.36.1|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.36.2|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.37.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.38.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.39.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.4.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.40.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.5.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.6.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.7.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.7.1|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.8.0|don't install laravel/framework v5.8.38
    - don't install illuminate/support v8.9.0|don't install laravel/framework v5.8.38
    - Installation request for laravel/framework (locked at v5.8.38, required as 5.8.*) -> satisfiable by laravel/framework[v5.8.38].


Installation failed, reverting ./composer.json to its original content.

Answer 1

It is not possible to install Fortify on Laravel 5.8, this library only supports Laravel 8.