  Cosmic-ray antiprotons are a powerful tool for astroparticle physics. While
the bulk of measured antiprotons is consistent with a secondary origin, the
precise data of the AMS-02 experiment provides us with encouraging prospects to
search for a subdominant primary component, e.g. from dark matter. In this
brief review, we discuss recent limits on heavy dark matter as well as a
tentative signal from annihilation of dark matter with a mass $\lesssim 100$
GeV. We emphasize the special role of systematic errors that can affect the
signal. In particular, we discuss recent progress in the modeling of secondary
production cross sections and correlated errors in the AMS-02 data, the
dominant ones originating from uncertainties in the cross sections for
cosmic-ray absorption in the detector.
