Stripe - Installation failed, reverting ./composer.json to its original content

i need you helpme. When install stripe I get this error

composer require cartalyst/stripe-laravel
Using version ^8.0 for cartalyst/stripe-laravel
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for cartalyst/stripe-laravel ^8.0 -> satisfiable by cartalyst/stripe-laravel[v8.0.0].
    - Conclusion: remove laravel/framework v5.5.40
    - Conclusion: don't install laravel/framework v5.5.40
    - cartalyst/stripe-laravel v8.0.0 requires illuminate/support 5.6.* -> satisfiable by illuminate/support[v5.6.0, v5.6.1, v5.6.10, v5.6.11, v5.6.12, v5.6.13, v5.6.14, v5.6.15, v5.6.16, v5.6.17, v5.6.2, v5.6.3, v5.6.4, v5.6.5, v5.6.6, v5.6.7, v5.6.8, v5.6.9].
    - don't install illuminate/support v5.6.4|don't install laravel/framework v5.5.40
    - don't install illuminate/support v5.6.5|don't install laravel/framework v5.5.40
    - don't install illuminate/support v5.6.6|don't install laravel/framework v5.5.40
    - don't install illuminate/support v5.6.7|don't install laravel/framework v5.5.40
    - don't install illuminate/support v5.6.0|don't install laravel/framework v5.5.40
    - don't install illuminate/support v5.6.1|don't install laravel/framework v5.5.40
    - illuminate/support v5.6.10 conflicts with laravel/framework[v5.5.40].
    - illuminate/support v5.6.11 conflicts with laravel/framework[v5.5.40].
    - illuminate/support v5.6.12 conflicts with laravel/framework[v5.5.40].
    - illuminate/support v5.6.13 conflicts with laravel/framework[v5.5.40].
    - illuminate/support v5.6.14 conflicts with laravel/framework[v5.5.40].
    - illuminate/support v5.6.15 conflicts with laravel/framework[v5.5.40].
    - illuminate/support v5.6.16 conflicts with laravel/framework[v5.5.40].
    - illuminate/support v5.6.17 conflicts with laravel/framework[v5.5.40].
    - don't install illuminate/support v5.6.2|don't install laravel/framework v5.5.40
    - don't install illuminate/support v5.6.3|don't install laravel/framework v5.5.40
    - illuminate/support v5.6.8 conflicts with laravel/framework[v5.5.40].
    - illuminate/support v5.6.9 conflicts with laravel/framework[v5.5.40].
    - Installation request for laravel/framework (locked at v5.5.40, required as 5.5.*) -> satisfiable by laravel/framework[v5.5.40].


Installation failed, reverting ./composer.json to its original content.

already modify the file composer replacing the * with 40 and it does not work

If you could explain to me step by step the solution please, thank you very much

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