Nepal is raising the permit fees to climb Mount Everest from $11,000 to $15,000. Income from the fees is a key source of revenue and employment for the cash-strapped country.

Nepal will increase the permit fees for climbing Mount Everest by more than 35%, making the world’s tallest peak more expensive for mountaineers for the first time in nearly a decade.

According to Glacier Himalaya Treks and Expedition, a private group of experienced mountaineers that offers tours, the permit fee for climbing Mount Everest will increase by $4,000 in September. The new rate will mean the popular route will cost $15,