Celebrity Cruises guests may need to budget more for their next sailing.

The cruise line hiked its daily gratuity rates on July 29. Passengers in Inside, Oceanview and Veranda staterooms will now pay $19.50 per guest, per day, up from $18, while the rate for Concierge and AquaClass staterooms increased from $19 to $20.50, according to an email shared with guests and the cruise line’s website.

Passengers staying in The Retreat, Celebrity’s luxe ship-within-a-ship area, will pay $24.50, up from $23.

“We hear directly from guests that our crew are the ones who help make vacation memories unforgettable,” Royal Caribbean Group, the cruise line’s parent company, told USA TODAY in an emailed statement. “In keeping with industry standards, gratuities are shared and are a part of crew compensation, reflecting their exceptional work.”

Those fees are automatically applied to passengers’ onboard accounts, though they can be adjusted up or down before the morning of disembarkation, according to Celebrity’s website. Guests can also opt to prepay gratuities.

“These gratuities are thoughtfully shared among our dining, bar and culinary teams, stateroom attendants, and the many crew members who help create the elevated experience you’ll enjoy onboard,” the cruise line said in the email to guests.

MSC, Carnival and Princess also raise gratuity rates

Celebrity isn’t the only cruise line to make that kind of change in recent months. MSC Cruises raised its Hotel Service Charge for Alaska and Caribbean sailings in May, and Carnival Cruise Line previously said it planned to raise daily gratuity rates and prices for one of its drink packages in April.

Princess Cruises began rolling out a higher Crew Appreciation charge in March. Cruise companies routinely increase those fees based on "external influences" such as inflation or changing economic activity, according to Danny Genung, CEO of travel agency Harr Travel.

"You look at the cost of hotels and transportation, fuel and food and everything else, and I think it's really just a normal response," Genung previously told USA TODAY. "You know, compensating employees, offsetting costs that have increased."