The MUonE experiment aims to provide a new, independent measurement of the hadronic vacuum polarisation (HVP) contribution to the muon g-2. Considering the disagreement between some recent lattice calculations and dispersive determinations, a third and fully independent result is extremely important. However, MUonE will require an unprecedented precision of 10^-5 to solve this disagreement.
I will introduce the MUonE experiment and explain the theory behind the our recent NNLO calculation as well as some future developments.