Laravel5.5 is not running in PHP7.0

As the Laravel 8 is not supported on PHP 7.0, I decided to go with lower version of Laravel. Because, we are not in the position of upgrading the server php version.

After reading the requirements here we found the latest Laravel version that is supported in PHP7.0 will be Laravel5.5.

we installed the version using composer. Below is the Laravel version in the server.

However, still the error shows in the nginx server as below

Composer detected issues in your platform: Your Composer dependencies require a PHP version ">= 7.2.5".

The composer.json in the laravel root directory as below

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": ">=7.0.0",
        "fideloper/proxy": "~3.3",
        "laravel/framework": "5.5.*",
        "laravel/tinker": "~1.0"
    },
    "require-dev": {
        "filp/whoops": "~2.0",
        "fzaninotto/faker": "~1.4",
        "mockery/mockery": "~1.0",
        "phpunit/phpunit": "~6.0",
        "symfony/thanks": "^1.0"
    },
}

Any workaround to bring the application live?

via Chebli Mohamed