On 28 May 1948, Pope Pius XII appointed Bugnini secretary to the Commission for Liturgical Reform, which created a revised rite for the Easter Vigil in 1951 and revised ceremonies for the rest of Holy Week in 1955.
In 1948, Pope Pius XII designated Bugnini as the chief administrator of the Commission for Liturgical Reform. This commission subsequently developed a new ritual for the Easter Vigil in 1951 and updated other Holy Week observances in 1955.