The September Uprising (Bulgarian: Септемврийско въстание, Septemvriysko vastanie) was an armed insurgency staged in September 1923 by the Bulgarian Communist Party (BCP) under Comintern pressure, as an attempt to overthrow the Alexander Tsankov's new government of Bulgaria that had come to power with the coup d'état of 9 June. Besides its communist base, the uprising was also supported by agrarians and anarchists.