It looks like today we have got a update for the untether package for the new TaiG jailbreak. The change log is 

Version 2.1.3 of this package removes some now-unneccessary TaiG’s uicache files, and speeds up boot time on the iPhone 4S.

A good thing about this update is all you need to do is open Cydia and you should see the update. After the sources have fully reloaded just click update in the top right. Now just wait for it to download and install. All that’s left is the rebooting of the device. So get to Cydia and get the update asap. 

Note the version number is wrong in the default repo. So it causes the package to keep thinking it needs to be updated. So only apply the update once.