  Recent results of the KASCADE-Grande experiment provided evidence for a mild
knee-like structure in the all-particle spectrum of cosmic rays at $E =
10^{16.92 \pm 0.10} \, \mathrm{eV}$, which was found to be due to a steepening
in the flux of heavy primary particles. The spectrum of the combined components
of light and intermediate masses was found to be compatible with a single power
law in the energy range from $10^{16.3} \, \mathrm{eV}$ to $10^{18} \,
\mathrm{eV}$. In this paper, we present an update of this analysis by using
data with increased statistics, originating both from a larger data set
including more recent measurements and by using a larger fiducial area. In
addition, optimized selection criteria for enhancing light primaries are
applied. We find a spectral feature for light elements, namely a hardening at
$E = 10^{17.08 \pm 0.08} \, \mathrm{eV}$ with a change of the power law index
from $-3.25 \pm 0.05$ to $-2.79 \pm 0.08$.
