升级 5.4 Composer update 报错了.

尝试把项目升级到5.4 ,最后 composer update 时候报错,有大神指导啥原因吗,求赐教。

composer.json:

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

composer install:

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].
《L03 构架 API 服务器》
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搞定了. 移除 ·require-Dev· 里面的几个包

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