[Laravel]composer requireでエラーが出る。Conclusion: remove laravel/framework v5.8.35

Question

###　やりたいこと
laravelcollectiveをインストールしたい。

やったこと

composer require laravelcollective/html

エラーメッセージ

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

  Problem 1
    - Conclusion: remove laravel/framework v5.8.35
    - Conclusion: don't install laravel/framework v5.8.35
    - laravelcollective/html 6.0.x-dev requires illuminate/view ^6.0 -> satisfiable by laravel/framework[6.x-dev], illuminate/view[6.x-dev, v6.0.0, v6.0.1, v6.0.2, v6.0.3, v6.0.4, v6.1.0, v6.2.0, v6.3.0, v6.4.1].
    - laravelcollective/html 6.0.x-dev requires illuminate/view ^6.0 -> satisfiable by laravel/framework[6.x-dev], illuminate/view[6.x-dev, v6.0.0, v6.0.1, v6.0.2, v6.0.3, v6.0.4, v6.1.0, v6.2.0, v6.3.0, v6.4.1].
    - laravelcollective/html v6.0.3 requires illuminate/view ^6.0 -> satisfiable by laravel/framework[6.x-dev], illuminate/view[6.x-dev, v6.0.0, v6.0.1, v6.0.2, v6.0.3, v6.0.4, v6.1.0, v6.2.0, v6.3.0, v6.4.1].
    - laravelcollective/html v6.0 requires illuminate/view 6.0.* -> satisfiable by illuminate/view[v6.0.0, v6.0.1, v6.0.2, v6.0.3, v6.0.4].
    - laravelcollective/html v6.0.1 requires illuminate/view 6.0.* -> satisfiable by illuminate/view[v6.0.0, v6.0.1, v6.0.2, v6.0.3, v6.0.4].
    - laravelcollective/html v6.0.2 requires illuminate/view 6.0.* -> satisfiable by illuminate/view[v6.0.0, v6.0.1, v6.0.2, v6.0.3, v6.0.4].
    - Can only install one of: laravel/framework[6.x-dev, v5.8.35].
    - don't install illuminate/view 6.x-dev|don't install laravel/framework v5.8.35
    - don't install illuminate/view v6.0.0|don't install laravel/framework v5.8.35
    - don't install illuminate/view v6.0.1|don't install laravel/framework v5.8.35
    - don't install illuminate/view v6.0.2|don't install laravel/framework v5.8.35
    - don't install illuminate/view v6.0.3|don't install laravel/framework v5.8.35
    - don't install illuminate/view v6.0.4|don't install laravel/framework v5.8.35
    - don't install illuminate/view v6.1.0|don't install laravel/framework v5.8.35
    - don't install illuminate/view v6.2.0|don't install laravel/framework v5.8.35
    - don't install illuminate/view v6.3.0|don't install laravel/framework v5.8.35
    - don't install illuminate/view v6.4.1|don't install laravel/framework v5.8.35
    - Installation request for laravel/framework (locked at v5.8.35, required as 5.8.*) -> satisfiable by laravel/framework[v5.8.35].
    - Installation request for laravelcollective/html ^6.0 -> satisfiable by laravelcollective/html[6.0.x-dev, v6.0, v6.0.1, v6.0.2, v6.0.3].


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

備考

composer.jsonの"require"には"laravel/framework": "5.8.*"があります。