The presented study is an updated search for magnetic monopoles using data taken with the ANTARES neutrino telescope over a period of 9 years (2008-2017). In accordance with some grand unification theories, magnetic monopoles were created during the phase of symmetry breaking in the early Universe, and accelerated by galactic magnetic fields. As a consequence of their high energy, they could cross the Earth and emit a significant signal in a Cherenkov-based telescope like ANTARES, for appropriate mass and velocity ranges. This analysis uses a run-by-run simulation strategy, as well as a new simulation of magnetic monopoles taking into account the Kasama, Yang and Goldhaber model for their cross section with matter. The results obtained for relativistic magnetic monopoles with β=v⁄c ≥ 0.57, where v is the magnetic monopole velocity and c the speed of light in vacuum, will be presented.