  In this work we study automorphisms of synchronous self-similar groups, the
existence of extensions to automorphisms of the full group of automorphisms of
the infinite rooted tree on which these groups act on. When they do exist, we
obtain conditions for the continuity of such extensions with respect to the
depth metric, but we also construct examples of groups where such extensions do
not exist. We study the case of the lamplighter group $\mathcal{L}_k =
\mathbb{Z}_k \wr \mathbb{Z}$
