The complete upgrade of this Image includes: Operating System patch upgrade,ERPNext

Website technology is changing with each passing day. Updates and upgrades are one of the maintenance tasks. Programs that are not upgraded for a long time, like buildings that are not maintained for a long time, will accelerate aging and gradually lose functionality until they are unavailable.

Start any upgrade,you should complete the backup first

Operating System &  running environmen Upgrade

If you are using the PostgreSQL on Linux Image of us,upgrade is very simple,just only one command

apt update && apt upgrade -y