in boot, I just updated from cider-nrepl 0.15 to 0.15.1 -- how do I updte cider on eamcs side ?

using the package manager. M-x list-packages. However cider-nrepl has been managed directly by CIDER for quite some time. CIDER will bring in the correct version so there are no mismatches. And the version of CIDER and cider-nrepl are by convention the same