Lotteria's corporate logo / Courtesy of Lotteria

Burgers at Lotteria will soon cost more.

The fast-food chain said Thursday it will raise prices on 22 burger menu items and other products beginning May 28, marking the company’s latest effort to cope with mounting pressure from rising costs and currency volatility.

Lotteria, operated by Lotte GRS under Chief Executive Lee Won-taek, said the overall increase would average 2.9 percent.

Its signature Ria Bulgogi Burger and Ria Shrimp Burger will each increase by 100 won ($0.07), bringing the standalone prices of both menu items to 5,100 won.