problem installing this package

[rohi1386]

Hello
I encountered a problem installing this package
My PHP version is 7.4
So I set the version of this package to 5.9.2
But again it shows this error

Your requirements could not be resolved to an installable set of packages.

Problem 1
- Root composer.json requires spatie/laravel-sitemap 5.9.2 -> satisfiable by spatie/laravel-sitemap[5.9.2].
- spatie/laravel-sitemap 5.9.2 requires illuminate/support ^8.0 -> found illuminate/support[v8.0.0, ..., 8.x-dev] but these were not loaded, likely b
ecause it conflicts with another require.

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