Nepal has banned solo climbers from scaling its mountains, including Mount Everest, in a bid to reduce accidents.
The new safety regulations also prohibit double amputee and blind climbers from attempting to reach the summit of the world's highest peak without a valid medical certificate.
A tourism official said the law had been revised to make mountaineering safer and to decrease deaths.
A record number of climbers have tried to climb Everest this year.
But among the record-breaking attempts, there has been the familiar tally of casualties.
The death toll so far this season stands at six, including 85-year-old Min Bahadur Sherchan, who died attempting to reclaim his title as the world's oldest person to reach the top.
World-renowned Swiss climber Ueli Steck, who was known as the "Swiss Machine", also died during a solo climb to a peak neighbouring Everest.