Volume 4 of the Karlstadt Edition has recently appeared. Covering the works of 1521, this volume shows Karlstadt standing at the centre of a broad publication current of the early Reformation. Themes include practical reforms ranging from clerical marriage to the renewal of the mass. At the same time, the first deeper fissures in the group of Wittenberg theologians are revealed. The publication of edition volumes 5 and 6 will follow in the first half of 2023.