If you are on 10 or 10.1, go to Settings > About phone > CyanogenMod updates, and change your update type to Nightly. Download, install, enjoy.
If you use Google Apps you must flash newer gapps. After CM update download the latest gapps here: http://goo.im/gapps. Currently the 10.2/4.3 package is 20130813. Reboot into recovery and flash the gapps zip.
Not on CyanogenMod? I recommend wiping everything and installing:
Download CM: http://get.cm/?device=p930
Download Google Apps: http://goo.im/gapps
Change Log: http://10.2.cmxlog.com/?device=p930