The IceCube Neutrino Observatory probes a breadth of particle physics through the DeepCore low-energy extension. DeepCore provides access to an abundance of earth-crossing neutrinos over much of the atmospheric cosmic-ray spectrum, from 5-100$\,$GeV. Over such baselines, and having overcome the kinematic threshold for $\nu_\tau$ charged current interactions, DeepCore provides unique multi-channel sensitivity to atmospheric oscillations (including $\nu_\tau$-appearance) with unprecedented statistical power. As a result, oscillations measurements from DeepCore are complementary to and competitive with those of long-baseline beam experiments. Here, recent and upcoming results from the current generation of IceCube oscillations analyses are summarised, including work upon an 8+ year dataset which represents a milestone in high-statistics atmospheric mixing measurements.