How to Upgrade Laravel 8.x to 9.x

1. open composer.json

2. delete  "fideloper/proxy": "^4.2",

3. change

Change `laravel/framework package from ^8.12 to ^9.0

Change nunomaduro/collision from ^5.0 to ^6.1

change facade/ignition to “spatie/laravel-ignition”: “¹.0”

Then run

composer update 

if fail, you can try

composer dump-autoload

then composer update