Abstract: A receptacle holding unit (1) for a device for preparing a beverage from an ingredient contained in a receptacle (2). A first part (10) and a second part (20) are movable between a closed position for holding said receptacle and an open position for inserting said receptacle and/or for removal therefrom. A fastening arrangement comprises a locking member (30) movable between:—a locking position for preventing relative rotational movement of the first and second engagement surfaces (11, 21) when the parts (10, 20) are in the closed position; and—an unlocking position for allowing relative rotational movement of the of the first and second engagements surfaces (11, 21) and engagement and disengagement thereof.