A new Roundcube upgrade is available: version 1.3.7. All our skins and plugins are fully compatible with this new version, so if you're running the latest version of our software, you should be able to upgrade without any problems.
What's new in Roundcube 1.3.7? It contains several bug fixes and a security fix for the way OpenPGP is used. If you'd like to read more about this latest relese, here's the release announcement.