  We present an analysis of the pion-nucleon sigma term on the CLS ensembles
with $N_f=2+1$ flavors of $\mathcal{O}(a)$-improved Wilson fermions. We perform
a chiral interpolation based on ensembles with pion masses ranging from 130 MeV
to roughly 350 MeV. The analysis covers four lattice spacings between $a\approx
[0.05 \, \rm{fm}\ldots 0.09\, \rm{fm}]$, allowing for an estimate of
systematics associated with lattice artefacts.
