Vulnerability Protection signatures out of date

Over the past week, I have been receiving the following error message when I boot my Macbook Pro w/Retina (15"):

The Vulnerability Protection signatures are out of date. Please run LiveUpdate immediately to download the latest signatures.

I run LiveUpdate and am told that I am up to date. I am running OS X v.10.9.5.

This doesn't appear to be causing any issues (that I can see or detect), but I am unsure if the vulnerability protection is working or actually up to date.

Mike