failure to install it on Laravel 8

[alinmiron]

Trying to install this package on Laravel 8.

unfortunately it fails

Problem 1
- spatie/laravel-collection-macros v6.x-dev requires illuminate/support ^6.0|^7.0 -> found illuminate/support[v6.0.0, ..., 6.x-dev, v7.0.0, ..., 7.x-dev] but these were not loaded, likely because it conflicts with another require.
- spatie/laravel-collection-macros 6.1.0 requires laravel/framework ^6.0|^7.0 -> found laravel/framework[v6.0.0, ..., 6.x-dev, v7.0.0, ..., 7.x-dev] but it conflicts with your root composer.json require (^8.0).
- Root composer.json requires spatie/laravel-collection-macros ^6.1 -> satisfiable by spatie/laravel-collection-macros[6.1.0, v6.x-dev].

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