This is the first service release to update the stable version 1.1. It contains some important bug fixes and improvements in error handling as well as a few new features and configuration options. See the full changelog here (http://trac.roundcube.net/wiki/Changelog).
It's considered stable and we recommend to update all productive installations of Roundcube with this version. Download it from roundcube.net/download (http://roundcube.net/download),
Please do backup your data before updating!
Source: http://roundcube.net/news/2015/03/18/update-1.1.1-released/
Get it Now: http://roundcube.net/download