Apple released an update for its AirPort Extreme base station and wireless networking software. AirPort Software 3.3 and the included AirPort Extreme base station firmware 5.3 are available from the Software Update control panel.
According to Apple, this software provides support for the Wi-Fi Protected Access (WPA) specification for the AirPort Extreme base station and AirPort Extreme and AirPort clients.
More information on AirPort Extreme is available from Apple’s Web site.