This applies to all, “regardless of their vaccination status, starting next Wednesday”, Saudi Arabia's Ministry of Hajj and Umrah said on Monday.
Pilgrims have to show they are vaccinated using the Tawakkalna app to enter the Grand Mosque in Mecca and Prophet's Mosque in Medina.
They should also book an Umrah or prayer slot using the app to be able to perform prayers or worship due to strict health and safety protocols.
Pilgrims must also wear masks and are advised to take safety precautions in line with COVID-19 protocols.
The Saudi Interior Ministry on Sunday said that all Saudi citizens must take a coronavirus vaccine booster dose to travel outside the Kingdom, starting from February 9.
The ministry said new COVID-19 cases in Saudi Arabia continue to decline, dropping below the 4,000-mark on Sunday.