composer update package code example
Example 1: upgrade composer version
composer self-update
Example 2: composer self update command
composer self-update
Example 3: composer update
php composer.phar update
Example 4: update particular package composer
composer update doctrine/doctrine-fixtures-bundle
Example 5: composer install without dependencies
composer install --ignore-platform-reqs
Example 6: upgrade composer
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