  We investigate the non-local thermodynamic equilibrium (NLTE) analysis for
\ion{Cu}{1} lines with the updated model atom that includes quantum-mechanical
rate coefficients of Cu\,$+$\,H and Cu$^+$\,$+$\,H$^-$ inelastic collisions
from the recent study of Belyaev et al. (2021). The influence of these data on
NLTE abundance determinations has been performed for six metal-poor stars in a
metallicity range of $-$2.59\,dex$\,\le$\,[Fe/H]\,$\le$\,$-$0.95\,dex. For
\ion{Cu}{1} lines, the application of accurate atomic data leads to a decrease
in the departure from LTE and lower copper abundances compared to that obtained
with the Drawin's theoretical approximation. To verify our adopted copper
atomic model, we also derived the LTE copper abundances of \ion{Cu}{2} lines
for the sample stars. A consistent copper abundance from the \ion{Cu}{1} (NLTE)
and \ion{Cu}{2} (LTE) lines has been obtained, which indicates the reliability
of our copper atomic model. It is noted that the [Cu/Fe] ratios increase with
increasing metallicity when
$\sim$\,$-$2.0\,dex\,$<$\,[Fe/H]\,$<$\,$\sim$\,$-$1.0\,dex, favoring a
secondary (metallicity-dependent) copper production.
