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We update the list of GeV-TeV extragalactic \gamma-ray sources using the2-year catalog from the Fermi-LAT and recent results ground-based \gamma-raytelescopes. Breaks in the spectra between the high energy (100 MeV <E< 300 GeV)and the very high energy (E> 200 GeV) ranges, and their dependence on distance,are discussed in the context of absorption on the extragalactic backgroundlight (EBL). We calculate the size of the expected break using a model for theEBL and compare it to the data taking into account systematic uncertainties inthe measurements. We develop a novel Bayeasian model to describe this datasetand use it to constrain two simple models for the EBL-induced breaks.

Evidence for a cosmological effect in \gamma-ray spectra of BL Lacs