An elevator system includes an elevator shaft, an elevator car arranged in the elevator shaft for movement, a drive unit for moving the elevator car, a machine platform that can be fastened in the elevator shaft and can be lifted along the elevator shaft, wherein the drive unit is fastened to the machine platform, and at least one lifting device for lifting the machine platform. The at least one lifting device includes a supporting element, a strand jack for moving along the supporting element, and an anchor for fastening the supporting element in the elevator shaft, wherein the supporting element is fastened in the elevator shaft by the anchor and the strand jack is arranged to move along the supporting element.