Problem with mono 1.1.13.6

[Brad <braddabug@comcast.net>]

I'm using Debian Testing, and I just did apt-get install mono and 
upgraded to mono 1.1.13.6, but whenever I try to run a mono program 
(being gmcs or a program I've build earlier with mono) I get this message:

Corlib not in sync with this runtime: expected corlib version 47, found 46.
Download a newer corlib or a newer runtime at http://www.go-mono.com/daily.

Is there another package I need? Is something wrong with the package 
dependencies?