cannot install on Laravel 8

PHP version | PHP/8.0.0
Laravel version | 8.19.0
Laravel Admin version 1.8.11

$ composer require fourn/admin-config
Using version ^1.1 for fourn/admin-config
./composer.json has been updated
Running composer update fourn/admin-config
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 fourn/admin-config ^1.1 -> satisfiable by fourn/admin-config[1.1.0].
    - fourn/admin-config 1.1.0 requires laravel/framework ^5.5|^6.0 -> found laravel/framework[v5.5.0, ..., 5.8.x-dev, v6.0.0, ..., 6.x-dev] but it conflicts with your root composer.json require (^8.12).

Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.

Installation failed, reverting ./composer.json and ./composer.lock to their original content.

laravel-admin-extensions / admin-config

cannot install on Laravel 8 #6