  Recently, many new dwarf spheroidal satellites (dSphs) have been discovered
by the Dark Energy Survey (DES). These dSphs are ideal candidates for probing
for gamma-ray emissions from dark matter (DM) annihilation. However, no
significant signature has been found by the Fermi-LAT dSph observations. In
this work, we reanalyze the Fermi-LAT Pass 8 data from the direction of
Reticulum II, where a slight excess has been reported by some previous studies.
We treat Reticulum II (DES J0335.6-5403) as a spatially extended source, and
and that no significant gamma-ray signature is observed. Based on this result,
we set upper-limits on the DM annihilation cross section.
