  The study of Boolean functions with low $c$-differential uniformity has
become recently an important topic of research. However, in odd characteristic
case, there are not many results on the ($c$-)differential uniformity of
functions that are not power functions. In this paper, we investigate the
$c$-differential uniformity of the swapped inverse functions in odd
characteristic, and show that their $c$-differential uniformities are at most 6
except for some special case.
