A transceiver assembly includes a cage and a heatsink. The cage includes first and second spaced apart walls and a third wall that spans the first and second walls. The third wall defines an opening, and the third wall includes two spring arms that each extend into the opening. The heatsink includes a heatsink body including a first surface and a protrusion that extends from the first surface of the heatsink body and a pair of spring-arm receivers positioned on the first surface of the heatsink body. Each of the pair of spring-arm engagement portions is configured to engage with a corresponding one of the two spring arms of the cage when the heatsink is attached to the cage.