laravel 5.4がインストールできない

Question

5.3からlaravelを5.4にアップグレードしました。

私は変更されましたcomposer.json、私は作曲家の更新を実行すると、私はエラーが発生しました。

composer.json：

"require": { 
     "php": ">=5.6.4", 
     "laravel/framework": "5.4.*", 
     "laravel/tinker": "~1.0" 
}, 

エラー：

git:(upgrade-5.4) ✗ composer install 
Loading composer repositories with package information 
Updating dependencies (including require-dev) 
Your requirements could not be resolved to an installable set of packages. 

Problem 1 
    - Conclusion: don't install symfony/console v3.2.2 
    - Installation request for mpociot/laravel-test-factory-helper ^0.3.1 -> satisfiable by mpociot/laravel-test-factory-helper[0.3.1]. 
    - Conclusion: don't install symfony/console v3.2.1 
    - laravel/framework v5.4.6 requires symfony/console ~3.2 -> satisfiable by symfony/console[v3.2.0, v3.2.1, v3.2.2]. 
    - laravel/framework v5.4.0 requires symfony/console ~3.2 -> satisfiable by symfony/console[v3.2.0, v3.2.1, v3.2.2]. 
    - laravel/framework v5.4.1 requires symfony/console ~3.2 -> satisfiable by symfony/console[v3.2.0, v3.2.1, v3.2.2]. 
    - laravel/framework v5.4.2 requires symfony/console ~3.2 -> satisfiable by symfony/console[v3.2.0, v3.2.1, v3.2.2]. 
    - laravel/framework v5.4.3 requires symfony/console ~3.2 -> satisfiable by symfony/console[v3.2.0, v3.2.1, v3.2.2]. 
    - laravel/framework v5.4.4 requires symfony/console ~3.2 -> satisfiable by symfony/console[v3.2.0, v3.2.1, v3.2.2]. 
    - laravel/framework v5.4.5 requires symfony/console ~3.2 -> satisfiable by symfony/console[v3.2.0, v3.2.1, v3.2.2]. 
    - Conclusion: don't install symfony/console v3.2.0|install symfony/console v3.2.1 
    - Installation request for laravel/framework 5.4.* -> satisfiable by laravel/framework[v5.4.0, v5.4.1, v5.4.2, v5.4.3, v5.4.4, v5.4.5, v5.4.6]. 

Answer 1

外しmpociot/laravel-test-factory-helperあなた（DEV-？）の依存関係からか、Laravel 5.4