+ 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. <code> composer update </code> ++ Upgrading a specific package <code> composer update horde/rdo </code> 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 <code> vendor/bin/horde-db-migrate up </code>