update composer using cmd code example
Example 1: upgrade composer version
composer self-update
Example 2: update composer on windows
php composer.phar self-update
Example 3: update packages composer global
composer global update
Example 4: composer update
php composer.phar update
Example 5: update composer php version
php7.3 -f /usr/local/bin/composer update
Example 6: update composer
To update composer command just find location of composer.phar and update as:
where composer
cd path_to_composer.phar
php composer.phar self-update