Upgrade composer version

composer self-update

Source: stackoverflow.com

Composer update

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

Update composer php version

php7.3 -f /usr/local/bin/composer update

Composer update

php composer.phar update

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