The MAGIC telescope has observed very-high energy gamma-ray emission from the BL Lac object PG 1553+113 in 2005 and 2006 at an overall significance is 8.8 \sigma .
The light curve shows no significant flux variations on a daily timescale .
The flux level during 2005 was , however , significantly higher as compared to 2006 .
The differential energy spectrum between \sim 90 GeV and 500 GeV is well described by a power law with a spectral index of -4.2 \pm 0.3 .
The photon energy spectrum and spectral modeling allow to pose upper limits of z = 0.74 and z = 0.56 , respectively , on the yet undetermined redshift of PG 1553+113 .
Recent VLT observations of this blazar show featureless spectra in the near-IR , thus no direct redshift could be determined from these measurements .