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An incremental version (4LAC-DR2) of the fourth catalog of active galacticnuclei (AGNs) detected by the Fermi-LAT is presented. This version isassociated with the second release of the 4FGL general catalog (based on 10years of data), where the spectral parameters, spectral energy distributions,yearly light curves, and associations have been updated for all sources. Thenew reported AGNs include two radio galaxies and 283 blazars. We brieflydescribe the properties of the new sample and outline changes affecting thepreviously published sample. Note: Users of this incremental release arerequested to cite the original 4LAC paper (Ajello M. et al., 2020, ApJ, 892,105).

The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope -- Data Release 2