The Constitution of the Czechoslovak Socialist Republic (Ústava Československé socialistické / Československej socialistickej republiky in Czech / Slovak), promulgated on 11 July 1960 as the constitutional law 100/1960 Sb., codified the Communist regime in Czechoslovakia. As the country's second post-war constitution, it replaced the 1948 Ninth-of-May Constitution and remained in force until the split of Czechoslovakia in 1992, though extensively revised especially after the Velvet Revolution.