What Blackberry model do you have?

Make sure that your desktop manager software is up to date, verison 5.0 is the latest release from Blackberry.com.

Then if BDM still doesn't recognize you have available updates then go directly to VZW's site here, and select the information that best fits your set up; model, BIS/BES etc.

On one of the pages it will list what version it is under the heading: Patch Name: Matienence Release (4.x.x.x)