Apple has released AirPort software updates, including:
• AirPort Client Update 2009-001: This update is recommended for all Intel-based Macintosh computers running Mac OS X 10.5.6.
• AirPort Utility 5.4.1: The simple to use, setup and management utility for the AirPort Express Base Station, the AirPort Extreme Base Station and Time Capsule.
• AirPort Utility 5.4.1 Windows: The simple to use, setup and management utility for the AirPort Express Base Station, the AirPort Extreme Base Station and Time Capsule.
The Mac updates listed above are available via Software Update.