How to upgrade from 1.0.3 to 1.2.3 version?

[zorenleolumosbog]

I've installed roundcube 1.0.3 since it was released and I realized to upgrade the latest version of it which is 1.2.3. Is it possible to upgrade with that thing? How can I do that?

[JohnDoh]

Upgrading instructions are included with Roubdcube, see https://github.com/roundcube/roundcubemail/blob/master/UPGRADING