Upgrade composer

Upgrade composer version

composer self-update

Source: stackoverflow.com

Composer self update command

composer self-update

Source: getcomposer.org

Upgrade to composer 2 windows

If going from version 1 to 2 use composer self-update
 --2

Composer upgrade to 2

run which composer (output /usr/bin/composer)
run php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
run sudo php composer-setup.php --install-dir=/usr/bin --filename=composer

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

Composer update

php composer.phar update

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