The CKM phase γ is the angle of the unitarity triangle which
is least well known. To reach the highest sensitivity to its value, all currently available measurements using hadronic tree decays by LHCb are combined, resulting in γ = (73+9−10)◦. The combination includes results from measurements of timeintegrated CP violation in B± → Dh±
and B0 → DK∗0 decays, with h a pion or kaon, and from a time-dependent measurement of CP violation using B0s → D±
s K∓ decays