+ Upgrading in Horde 6
You can either upgrade an app or library and its dependency tree or the whole Horde installation.
++ Upgrading the whole tree to latest Horde 6
This will honor any version constraints you have applied and any internal dependency constraints.
++ Upgrading a specific package
composer update horde/rdo
The installer will notify you of any conflicts preventing the upgrade
++ Running schema upgrades after a software update
You need to run this command to upgrade the database schema after an update