downgrade laravel-sitemap in laravel 5.6.4

I have project Laravel with 5.6.4 I can't upgrade php because it isn't suitable for Laravel 5.6.4 so I installed PHP 5.6.4 but I have a problem in spatie/laravel-sitemap not suitable for PHP 5.6.4 (Problem 1 - spatie/laravel-sitemap[2.2.0, ..., 2.4.0] require php ^7.0 -> your php version (5.6.40) does not satisfy that requirement. - Root composer.json requires spatie/laravel-sitemap ^2.2 -> satisfiable by spatie/laravel-sitemap[2.2.0, ..., 2.4.0)

and I tried many versions and made problems also I want suitable version of spatie/laravel-sitemap with php 5.6.4

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