Anticipating precise measurements of Higgs boson production in weak-boson fusion at the HL-LHC many theoretical studies of this process need to be revisited. I present first steps in this direction. In contrast to earlier computations at NNLO QCD, decays of the Higgs boson at leading order are included. For the first time we also study effects of anomalous weak couplings of the Higgs boson at this order.