Unable to update a laravel project from 5.5 to 5.7

I recently started working on a project that was originally in Laravel 5.2 which I successfully upgraded to Laravel 5.5 however now I'm trying to upgrade once again to Laravel 5.7 but when I do a composer update it gets stuck at Resolving dependencies through SAT. Here is the required and required-dev section of composer.json file:

    "require": {
        "php": "^7.2.0",
        "laravel/framework": "5.7.*",
        "laravel/tinker": "~1.0",
        "laravelcollective/html": "^5.5.0",
        "unisharp/laravel-ckeditor": "^4.5",
        "barryvdh/laravel-debugbar": "^3.1",
        "milon/barcode": "^5.2",
        "barryvdh/laravel-dompdf": "^0.8.0",
        "hisorange/browser-detect": "2.*",
        "sentry/sentry-laravel": "^0.7.0",
        "laravel/cashier": "~6.0",
        "dingo/api": "1.0.*@dev"
    },
    "require-dev": {
        "fzaninotto/faker": "^1.4",
        "mockery/mockery": "^1.0",
        "phpunit/phpunit": "^7.0",
        "symfony/css-selector": "2.8.*|3.0.*",
        "symfony/dom-crawler": "2.8.*|3.0.*",
        "xethron/migrations-generator": "dev-l5",
        "way/generators": "dev-feature/laravel-five-stable"
    },

Not sure what could be the problem.... Is there something missing?

via Chebli Mohamed