Apple released an update for two two older products Thursday, specifically updating the Airport Admin Utility for both the Graphite and Snow versions of the Airport base station. The sparse update notes said that, "This update provides compatibility for Mac OS X v10.5 or later."
The patch notes also note that version 5.3.1 or later of Airport Admin Utility should be used for more recent models of Appleis Airport base station line, including Time Capsule.
This update is a 6 MB download, and can be downloaded from Appleis Support site. Users with these models should be able to download it through Software Update, as well.