  This talk presents details of the calculation of two-loop corrections to
heavy baryon currents containing one heavy quark in leading order of the
$1/m_Q$-expansion, i.e. in the limit of Heavy Quark Symmetry (HQS). The
calculations lead to the determination of the anomalous dimension of these
currents. I also discuss problems with different $\gamma_5$-schemes and their
solution by the finite renormalization procedure.
