We’re pleased to announce an update for the roundcubemail packages, version 1.4-beta36.

This update is an upstream release adapted to Kolab 16, available for CentOS 7, Debian 8, Debian 9, Red Hat Enterprise Linux 7 and Ubuntu 16.04, and for Plesk Premium Email version 16 for CentOS 7, Debian 8, Debian 9, Red Hat Enterprise Linux 7 and Ubuntu 16.04.

More information can be found here:

https://roundcube.net/news/2018/08/25/roundcube-1.4-beta-released