GRUB Startup Options With v. 13.1

I just upgraded my desktop PC from v. 12.3 to v. 13.1 (64-bit).
The upgrade was done via the DVD method by selecting to upgrade an existing version.

Everything seems to have gone very well, except for a minor problem: When booting up GRUB presents the following choice:
Desktop -- openSUSE 12.3 - 3.7.10-1.16

How do I get GRUB to let me boot up v. 13.1 (and whatever kernel comes with it!) instead?

I thought that by executing (as Root) I would solve this little problem but the OS informs me that it does not recognize the command...