Payday 2 has been updated to a new version today for Winter Wonderland. You can get the complete patch notes for this update from here.
Starbreeze is bringing new festive items and cosmetics as part of the Winter Wonderland update. They have also implemented a number of bug fixes to the game. In addition to this, there are some fixes for crashes. Get the details on this update below, or take a look at the Steam forums.