Composer 下载 Laravel6.0 为什么用 artisan 查出来的版本是 6.5 的

vagrant@homestead:~/code$ composer create-project laravel/laravel=6.0.* demo --prefer-dist
Installing laravel/laravel (v6.0.2)
  - Installing laravel/laravel (v6.0.2): Loading from cache
Created project in cgedu_6.0
> @php -r "file_exists('.env') || copy('.env.example', '.env');"
Loading composer repositories with package information
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vagrant@homestead:~/code$ cd demo/
vagrant@homestead:~/code/demo$ php artisan --version
Laravel Framework 6.15.0Copy