How to update Laravel Application (not the composer dependencies)

I have an question regarding updates on the application (core) of a Laravel application.

Normaly I run the composer update command to update all of its dependencies. For de laravel framework the package laravel/framework is used.

But they made some changes in this package which needs you to make changes in the core application (not in composer). The core application is de package laravel/laravel.

For example, in this commit they have made a function called confirmPassword() which referres to a file ConfirmPasswordController.php in the package laravel/laravel. But this file didn't exists on my application because my application is not up-to-date.

My question
How do i keep my core application up to date?

Errors
See a typical example of updating the dependencies but not the application here.

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