The Vatican has tightened up its guidance on recognizing supernatural phenomena such as apparitions of the Virgin Mary and seemingly blood-soaked crucifixes.

The new guidelines replace rules drawn up in 1978 and say that bishops should no longer act independently over such sightings but instead consult the Vatican.

The changes made by the Vatican’s doctrinal office (DDF) aim to to bring the church up to date in responding to the swift spread of claims of apparitions online.