In the Letter, we presented a new 55Ni(p,γ) 56Cu reaction rate based on our measured 56Cu mass and the resonance information taken from . The rate reported in the Letter is incorrect due to an incorrect scaling of the penetrability factor in the proton widths. In this Erratum, we report an updated rate along with recommended REACLIB parameters, and we reevaluate the change in the mass distribution of rp-process ashes. (Table Presented). The corrected rate for the 579.8 keV Q value reported in the Letter is given in Table I, with the REACLIB parameters given in Table II. The change in the mass distribution of the rp-process ashes (similar to Fig. 5 in the Letter) is shown in Fig. 1. The recalculated ash composition, using a single zone model, for a typical x-ray burst trajectory  shows a less dramatic effect on the ashes using both the mass reported in this work as well as the mass reported in  (which was also incorrectly scaled in the Letter). We would like to stress, however, that these calculations assume a large β-delayed proton emission branch of 78% for 57Zn from , which would return most of the bypassed flow back into the 56Ni waiting point. With the mass measurement of 56Cu reported in this Letter significantly constraining the Q value of the first reaction in the bypass sequence 55Ni(p,γ) 56Cu, the β-delayed proton emission branch of 57Zn is now the most significant uncertainty to determine if a bypass of the 56Ni rp-process waiting point is strong. We would like to thank the authors of  for pointing out this error.