If you face a composer incompatibility with composer 2 at our servers run this commands as sudo:
curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer --version=1.10.16
Check composer version with:
php /usr/local/bin/composer -v
Then run your command:
su mage_owner -s /bin/bash -c "php /usr/local/bin/composer update vendor/module"
In case of difficulties let us know via helpdesk.