Princess cruises raised their drink package (found here). As Carnival owns Princess, it was only time that they raised prices as well.  So it was 3.6% increase, I mean it is only 2 dollars.  Cheers package is the one that had the price increase. The cheers package consists of the following:

• 15 alcoholic drinks every 24 hours
• Milkshakes
• soda
• mocktails
• energy drinks
• specialty coffees
• teas

The milkshakes and sodas are good and so the package might be of value.  If you would like to keep the old price on your next cruise you have until Dec. 31, 2017, to pre-purchase it.  See what USA Today has to say about it.

The line’s Cheers! package lets passengers order up to 15 alcoholic drinks a day.

Source: Carnival Cruise Line hikes cost for Cheers! drinks package