FullJS uses APT (Advanced Package Tool) to handle its installation and removal.
Roughly every 4 weeks a new major Stable release is done, so you should be prepared to update at least this often.
Update the list of packages known by your system
Upgrade the FullJS package and all its dependencies
The commands below installs the FullJS environment and its dependencies on your server.
apt --only-upgrade install fulljs
Automatic Upgrading (UnattendedUpgrades)
The purpose of unattended-upgrades is to keep FullJS current with the latest security (and other) updates automatically.
For more information please visit https://wiki.debian.org/UnattendedUpgrades