Apple has released AirPort Utility 5.3.1 for Leopard and Tiger Macs and Windows systems.
It's the latest update to the software which controls AirPort Extreme Base Station, AirPort Express Base Station and Time Capsule. The new release is available for download using Software Update or directly from Apple's website.
Apple says the software, which weighs in at 8.8MB to 10.2MB dependent on which version your must instal, "includes general fixes and compatibility updates" for AirPort Utility, AirPort Disk Utility and AirPort Base Station Agent. No further details have been provided.