The Tourism Department Friday announced two changes in the St. Croix cruise ship schedule.

Celebrity’s Summit will make an unscheduled visit to St. Croix from 8:30 a.m. to 5:30 p.m. Sunday. The Maasdam, a Holland America ship, has rescheduled its call from Thursday to April 24. It arrives at 10 a.m. and departs at 6 p.m.

Both ships will dock at the Frederiksted Pier.