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Observations of the gamma-ray sky with Fermi led to significant advancestowards understanding blazars, the most extreme class of Active GalacticNuclei. A large fraction of the population detected by Fermi is formed by BLLacertae (BL Lac) objects, whose sample has always suffered from a severeredshift incompleteness due to the quasi-featureless optical spectra. Our goalis to provide a significant increase of the number of confirmed high-redshiftBL Lac objects contained in the 2 LAC Fermi/LAT catalog. For 103 Fermi/LATblazars, photometric redshifts using spectral energy distribution fitting havebeen obtained. The photometry includes 13 broad-band filters from the farultraviolet to the near-IR observed with Swift/UVOT and the multi-channelimager GROND at the MPG/ESO 2.2m telescope. Data have been takenquasi-simultaneously and the remaining source-intrinsic variability has beencorrected for. We release the UV-to-near-IR 13-band photometry for all 103sources and provide redshift constraints for 75 sources without previouslyknown redshift. Out of those, eight have reliable photometric redshifts atz>1.3, while for the other 67 sources we provide upper limits. Six of theformer eight are BL Lac objects, which quadruples the sample of confirmedhigh-redshift BL Lac. This includes three sources with redshifts higher thanthe previous record for BL Lac, including CRATES J0402-2615 with the best-fitsolution at z~1.9.

BL Lacertae objects beyond redshift 1.3 - UV-to-NIR photometry and photometric redshift for Fermi/LAT blazars