Workaround for Socialite ^3.0

App\Managers\CustomSocialiteManager.php

<?php

namespace App\Managers;

use App\Providers\CustomGoogleProvider;
use Laravel\Socialite\SocialiteManager;

class CustomSocialiteManager extends SocialiteManager
{
    /**
     * Create an instance of the specified driver.
     *
     * @return \Laravel\Socialite\Two\AbstractProvider
     */
    protected function createGoogleDriver()
    {
        $config = $this->app['config']['services.google'];

        return $this->buildProvider(
            CustomGoogleProvider::class, $config
        );
    }
}

App\Providers\AppServiceProvider.php

<?php

namespace App\Providers;

use App\Managers\CustomSocialiteManager;
use Illuminate\Support\ServiceProvider;
use Laravel\Socialite\Contracts\Factory;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        //...
    }

    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        $this->app->singleton(Factory::class, function ($app) {
            return new CustomSocialiteManager($app);
        });
    }
}

App\Providers\CustomGoogleProvider.php

<?php

namespace App\Providers;

use Illuminate\Support\Arr;
use Laravel\Socialite\Two\GoogleProvider;

class CustomGoogleProvider extends GoogleProvider
{
    /**
     * {@inheritdoc}
     */
    protected function getUserByToken($token)
    {
        $response = $this->getHttpClient()->get('https://www.googleapis.com/userinfo/v2/me?', [
            'query' => [
                'prettyPrint' => 'false',
            ],
            'headers' => [
                'Accept' => 'application/json',
                'Authorization' => 'Bearer '.$token,
            ],
        ]);

        return json_decode($response->getBody(), true);
    }

    /**
     * {@inheritdoc}
     */
    protected function mapUserToObject(array $user)
    {
        $avatarUrl = Arr::get($user, 'picture');

        return (new User)->setRaw($user)->map([
            'id' => $user['id'],
            'nickname' => Arr::get($user, 'nickname'),
            'name' => Arr::get($user, 'name'),
            'email' => Arr::get($user, 'email'),
            'avatar' => $avatarUrl,
            'avatar_original' => preg_replace('/\?sz=([0-9]+)/', '', $avatarUrl),
        ]);
    }
}