PHP 7.4.3
Laravel 版本：7.24
我只是尝试 composer require laravel/telescope 并且 composer install 失败。
Using version ^4.0 for laravel/telescope
./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 laravel/telescope ^4.0 -> satisfiable by laravel/telescope[4.x-dev, v4.0.0].
- Can only install one of: laravel/framework[v7.28.1, 8.x-dev].
- Can only install one of: laravel/framework[8.x-dev, v7.28.1].
- Can only install one of: laravel/framework[8.x-dev, v7.28.1]. …