It has been a while since AT&T pushed an official OS for the BlackBerry Torch 9800. Martin and a few others let us know that they have pushed out OS v188.8.131.526. Simply plug your device to your PC and start Desktop manger and you will be prompted to do the update. This update was leaked last weekend you can read about it at this link.
Note: I highly recommend that you backup your device before doing the update because you do not want to run the risk of something going wrong with the update.