Any way to update a console-less SuSE 7.3?

I have a system with SuSE Linux 7.3 installed, and I believe some of the system packages need updating. The system is running without monitor and keyboard, I administrate it through ssh sessions. What can I do to use SuSE's update service? When I issue 'yast2', I get a message about the X11 connection being rejected (of course!). Is it possible to update such a system at all without taking it out of service and connect monitor and keyboard? Best regards, David List