  ESSnuSB is a unique future proposed long-baseline experiment in Sweden to
study neutrino oscillation by probing the second oscillation maximum. In this
proceeding, we update the flux and efficiencies and re-calculate the
sensitivity of ESSnuSB in the standard three flavour scenario. We find that it
has excellent sensitivity to the Dirac CP phase $\delta_{\rm CP}$, moderate
sensitivity to the mass hierarchy of the neutrinos and limited sensitivity to
measure the octant of the atmospheric mixing angle $\theta_{23}$. We also find
that it has a very good sensitivity to constrain the atmospheric mass squared
difference $|\Delta m^2_{31}|$.
