Recent experimental results have shown that the optical potential is much more repulsive at energies above 400 MeV/nucleon than believed at the beginning of the eighties. Taking these new data into account we present a new parametrization of the optical potential, of the underlying bare nucleon-nucleon interaction, as well as of its expectation value for Gaussian wave functions as used in quantum molecular dynamics calculation. For the case Au+Au [ital b]=3 fm we compare the result for several observables with that obtained employing the old parametrization.