actualizar a versão do compositor
composer self-update
actualizar o compositor de pacotes em particular
composer update doctrine/doctrine-fixtures-bundle
composer instalar sem dependências
composer install --ignore-platform-reqs
actualização do compositor do php
php composer.phar update
actualizar o compositor
To update composer command just find location of composer.phar and update as:
where composer #Retrieves you location of your composer.phar
cd path_to_composer.phar #Move to directory with composer.phar
php composer.phar self-update #Update your composer
compositor adicionar um pacote
composer require name-of-package