How to update the form dependencies for laravel 5.3 or 5.4 project which is already installed

I have followed these steps,

composer require "laravelcollective/html":"^5.3.0"

Next, add your new provider to the providers array of config/app.php:

 'providers' => [
    // ...
    Collective\Html\HtmlServiceProvider::class,
    // ...
  ],

Finally, add two class aliases to the aliases array of config/app.php:

 'aliases' => [
    // ...
      'Form' => Collective\Html\FormFacade::class,
      'Html' => Collective\Html\HtmlFacade::class,
    // ...
  ],

I have already have installed laravel project. I have followed the above steps and i got a new composer.json, composer.lock and vendor files generated. How do i use these files in my project which is already installed without the form dependencies

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