We were just there last week and were able to upgrade our 4 day passes to 6 day passes. However, we had purchased them through Disneys travel company and had bought them back in January. We were told we were "lucky" because if we bought them after March, we would not have been able to upgrade them. We had 4 day park hoppers. I first added a day to 2 of the tix, making them 5 day hoppers for a cost of 12 and 10 dollars each(adult and child price). I was amazed! Then the following day I turned 3 tix into 5 day passes for $12 each and made the 2 five day tix into 6 day passes for $5 each! I was very happy w that! I had to go to the Disney travel office in downtown Disney to do this. I guess it depends where your tickets are from, and when you got them. Good luck!