Apple released AirPort Base Station Firmware Update 7.6.4 on Tuesday, a maintenance release for the company's line of Wi-Fi routers that squashes three bugs. One affects Apple's Time Capsule models, another deals with IPv6 issues, and a third fixes iOS device connectivity.
Apple's patch notes:
This update is available for all Apple 802.11n Wi-Fi base stations including AirPort Express, AirPort Extreme, and AirPort Time Capsule. It contains fixes that:
- Resolve an issue that may cause AirPort Time Capsule to report that the backup disk is in use
- Resolve an issue that may cause an IPv6 Tunnel error
- Resolve an issue that may intermittently cause a loss in Wi-Fi connectivity with iOS devices
Note: This firmware update is for all 802.11n AirPort base stations.
As noted by BurmaYank in the comments below, you can find the update in AirPort Utility on your Mac. The update may show up immediately in the form of a dialog box. If not, you can click Edit within AirPort Utility and look for the Update button.