Let $f:X \to T$ be a flat, projective morphism of noetherian schemes with $T$ an irreducible curve. Suppose that there exists a point $o \in T$ such that  the fiber $f^{-1}(o)$ is Fano. Is it true that in this case, for all $t$ near $o$, the fiber $f^{-1}(t)$ is Fano?

N.B. If necessary, one can assume that $f$ is smooth, but if such a statement holds without this assumption, it will be more interesting.