A vehicle includes a floor and a seat supported by the floor. The seat is translatable relative to the floor along a longitudinal axis of the vehicle. An airbag housing is supported by the floor and is disposed alongside the seat. The airbag housing is translatable relative to the floor along the longitudinal axis. An airbag is supported by the airbag housing. The airbag is inflatable to an inflated position that extends from the airbag housing away from the floor.