Abstract: Examples disclosed herein relate to a plying a firmware update to a stacked network device. In an example, ports on a stacked network device that are used in a data path between an uplink device and a downlink device via the stacked network device may be identified. The stacked network device may be in a stacked configuration with a second network device. Each of the identified ports on the network device may be in respective link aggregation groups with respective ports on the second network device, LACP collecting flag for the ports on the stacked network device may be disabled. The egress traffic on the ports of the stacked network device may be drained. The data path may be disabled. A firmware update may be applied to the stacked network device.