My composer json is like this :
I do : composer update
There exist error like this :
$ composer update
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
- 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].
How can I solve it?
See https://getcomposer.org/doc/04-schema.md#minimum-stability, try setting minimum-stability to "dev", and run composer update again.