In this work, we have realized a synthetic frequency dimension for light in a fibre ring cavity. This system allows us to mimic the motion of a particle in a periodic crystal. By exciting a temporal cavity soliton inside the fibre ring, we have demonstrated the existence of perpetual Bloch oscillations, despite the detrimental effects of dissipation. Our results offer strong potential for the study of complex phenomena inspired from solid-state physics, which are difficult to explore in their natural environment.