Composer should self-update itself during upgrade script

[opi]

See a full failing upgrade log https://paste.yunohost.org/raw/esiyuhokak

After manual upgrade of /var/www/roundcube/composer.phar the upgrade run without issue.

[maniackcrudelis]

How did you upgrade composer.phar ?

[opi]

cd /var/www/roundcube and the following script https://getcomposer.org/download/

I previously tried to run /var/www/roundcube/composer.phar self-upgrade but run into an issue, probably because my composer is too old, don't know