How Can I Update My SRCDS Garry's Mod Server?

I just found out that you can't use the hldsupdatetool for server updates anymore, and discovered SteamCMD, but even after I launch the program, my .bat still reads "Your server is out of date. Please update and restart."

I'm just wondering if I need to enter any additional code for SteamCMD to update my server.

Thanks.