wich composer version for laravel 7 code example

Example 1: install laravel

laravel install on windows
-----------------------------------
1-composer install
https://getcomposer.org/download/
2-laravel install using composer
composer global require laravel/installer
3-create new project
laravel new blog
cd blog 
4-serve project to localhost
php artisan serve

Example 2: laravel 7 upgrade

$>which composer
/usr/local/bin/composer

$>php -d memory_limit=512M /usr/local/bin/composer update
...