This document discusses using LHCb data on charm production to constrain the small-x gluon and improve predictions for neutrino fluxes. LHCb data at 7 TeV, 5 TeV and 13 TeV provides stringent constraints on the small-x gluon beyond HERA. This improved gluon allows more accurate predictions for signals and backgrounds at neutrino telescopes. At a 100 TeV collider, inclusive cross sections depend directly on small-x PDFs, but using LHCb data leads to stabilized predictions with reduced uncertainties.