A security apparatus for a portable electronic device having a slot includes a body having an insertable portion configured to be inserted into the slot of the portable electronic device, and a boss extending from the insertable portion and positioned outside of the slot. The boss is configured to attach to a lock head. The security apparatus also includes a wedge supported at least partially within the insertable portion of the body. The wedge is movable relative to the insertable portion between a first position, in which the wedge extends out of the insertable portion and is configured to engage a surface of the portable electronic device that defines the slot, and a second position, in which the wedge is retracted relative to the first position and is configured to disengage the surface of the portable electronic device that defines the slot.