php-Laravel Composer发现错误的PHP版本

我创建了一个全新的Laravel项目。当我运行composer install时，我得到了一个错误：

Root composer.json requires php ^8.0.2 but your php version (7.4.27) does not satisfy that requirement.

但如果我跑php -v it shows version 8.1.2

我得到以下结果

PHP7.1.10（cli）（构建时间：2017年10月12日14:00:12）（ZTS）

这是我的 composer.json 的内容

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": ">=5.6.4",
        "doctrine/dbal": "^2.6",
        "guzzlehttp/guzzle": "^6.3",
        "intervention/image": "^2.4",
        "intervention/imagecache": "^2.3",
        "laravel/framework": "5.4.*",
        "laravel/tinker": "~1.0",
        "laravelcollective/html": "^5.4",
        "maatwebsite/excel": "^2.1",
        "sentry/sentry-laravel": "^0.8.0",
        "spatie/laravel-glide": "^3.2",
        "spatie/laravel-permission": "^2.6",
        "spatie/laravel-pjax": "^1.3"
    },
    "require-dev": {
        "fzaninotto/faker": "~1.4",
        "mockery/mockery": "0.9.*",
        "phpunit/phpunit": "~5.7"
    },
    "autoload": {
        "classmap": [
            "database"
        ],
        "psr-4": {
            "App\\": "app/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Tests\\": "tests/"
        }
    },
    "scripts": {
        "post-root-package-install": [
            "php -r \"file_exists('.env') || copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "php artisan key:generate"
        ],
        "post-install-cmd": [
            "Illuminate\\Foundation\\ComposerScripts::postInstall",
            "php artisan optimize"
        ],
        "post-update-cmd": [
            "Illuminate\\Foundation\\ComposerScripts::postUpdate",
            "php artisan optimize"
        ]
    },
    "config": {
        "preferred-install": "dist",
        "sort-packages": true,
        "optimize-autoloader": true
    }
}

这个项目怎么可能认为我运行了PHP5.6？

非常感谢。