Hi Cao,
here you can find some documentation:
How did you install it?
As a package or do you have an archive installation?
With a package installation you simply update the system with e.g.apt upgrade
.
During the archive installation-update, you simply replace the installation and check in the setup whether there is still work to be done.
Make a backup of the directory and the database beforehand!
Archives-installations are not recommended!
Greeting
Stefan