Massive QCD at five loops

The HL-LHC, and especially any future Higgs factory, will probe the Higgs couplings to heavy quarks with percent-level or even better precision. To be ready for such measurements we have to know the corresponding quark masses extremely well. I will talk about how this motivates us to explore QCD with massive quarks at five loops and what else we can learn there. I will show some first results for the heavy-quark condensate.