  We show that the proper inclusion of soft reparameterization modes in the
Sachdev-Ye-Kitaev model of $N$ randomly interacting Majorana fermions reduces
its long-time behavior to that of Liouville quantum mechanics. As a result, all
zero temperature correlation functions decay with the universal exponent
$\propto \tau^{-3/2}$ for times larger than the inverse single particle level
spacing $\tau\gg N\ln N$. In the particular case of the single particle Green
function this behavior is manifestation of the zero-bias anomaly, or scaling in
energy as $\epsilon^{1/2}$. We also present exact diagonalization study
supporting our conclusions.
