9.1 to 9.3 Upgrade

Hi, I've installed Suse 9.1 on my machine, and i'd like to upgrade it to 9.3. Does novell provide any means to update the linux version from 9.1 to 9.3 (9.1 to 9.2 and 9.2 to 9.3). Or I've to download complete dvd image of 9.3 only. Thanks in advance, Surya