我的作曲家json是这样的：
我这样做：composer update
存在这样的错误：
$ composer update
使用包信息加载作曲家存储库更新 依赖项（包括require-dev）您的要求不可能 解决了一组可安装的软件包。
问题1
- laravelcollective/html dev-master requires illuminate/http 5.5.* -> satisfiable by illuminate/http[5.5.x-dev] but these conflict with your requirements or minimum-stability. - laravelcollective/html dev-master requires illuminate/http 5.5.* -> satisfiable by illuminate/http[5.5.x-dev] but these conflict with your requirements or minimum-stability. - Installation request for laravelcollective/html dev-master -> satisfiable by laravelcollective/html[dev-master].
我该如何解决？