[root@server bin]# composer require fof/nightmode
Do not run Composer as root/super user! See https://getcomposer.org/root for details
Continue as root/super user [yes]? yes
Using version 0.6.0 for fof/nightmode
./composer.json has been updated
Running composer update fof/nightmode
Loading composer repositories with package information
Updating dependencies
Your requirements could not be resolved to an installable set of packages.
Problem 1
- Root composer.json requires fof/nightmode 0.6.0 -> satisfiable by fof/nightmode[0.6.0].
- fof/nightmode 0.6.0 requires flarum/core 0.1.0-beta.14 -> found flarum/core[dev-master, v0.1.0-beta.14, v0.1.0-beta.14.1, 0.1.x-dev (alias of dev-master)] but it does not match your minimum-stability.
Installation failed, reverting ./composer.json and ./composer.lock to their original content.
[root@server bin]#
how to solve this problem