مشکل نصب پکیج در لاراول

سلام خدمت دوستان عزیز
میخوام پکیج Eloquent-Sluggable نصب کنم اما با خطای زیر روبرو میشم ( نسخه لاراول 6 هست)

The "6.0" constraint for "cviebrock/eloquent-sluggable" appears too strict and will likely not match what you want. See https://getcomposer.org/constraints
./composer.json has been updated
Running composer update cviebrock/eloquent-sluggable
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 cviebrock/eloquent-sluggable 6.0 -> satisfiable by cviebrock/eloquent-sluggable[6.0.0].
    - cviebrock/eloquent-sluggable 6.0.0 requires illuminate/config ~6.0.0 -> found illuminate/config[v6.0.0, ..., v6.0.4] but these were not loaded, likely because it conflicts with another require.

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

دستوری که برای نصب پکیج وارد میکنم

composer require cviebrock/eloquent-sluggable:^6.0

ممنون میشم راهنمایی کنید