  The gravitational perturbation of the Morris-Thorne wormhole has been derived
by using the Newman-Penrose formalism. We apply Teukolsky equation to the
wormhole spacetime, compute the perturbed Weyl scalars, $\Psi_{4}^{(1)}$ and
obtain its master equation, decomposed in spin weighted spherical harmonics
with spin weight $-2$. For simplicity, we consider the perturbation provoked by
a single gaussian pulse of pressureless dust matter.
