IceTop is the 1 km2 surface array of the IceCube neutrino observatory. IceTop detects cosmic-ray air showers in the PeV to EeV energy range, but is losing sensitivity due to snow coverage. A planned enhancement by scintillation and radio detectors on the surface will solve this problem and increase the measurement accuracy for the energy and mass of the primary particles initiating the air showers. In addition to providing a veto and calibration tool for in-ice detectors, the more accurate measurement of the cosmic-ray mass composition and absolute flux will help us to better understand atmospheric muon and neutrino fluxes, which are important backgrounds for IceCube’s astrophysical neutrino measurements. Moreover, the increase in accuracy and sky coverage compared to the current IceTop will enable new science goals: The improved classification of the primary particle will help to determine the transition from Galactic to extragalactic sources expected at energies between 100 PeV to a few EeV, and the search for PeV photons provides direct discovery potential for the - yet unknown - most energetic Galactic sources. This talk will provide an overview about the prototype detectors existing at the South Pole, and the plans for the upgrade of the full IceTop arrays in the next years.