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Context: The Galactic Center IRS 13E cluster is located ~3.2'' from SgrA*. Itis an extremely dense stellar association containing several Wolf-Rayet andO-type stars, at least four of which show a common velocity. Only half anarcsecond north from IRS 13E there is a complex of extremely red sources,so-called IRS 13N. Their nature is still unclear. Based on the analysis oftheir colors, there are two main possibilities: (1) dust embedded sources olderthan few Myr, or (2) extremely young objects with ages less than 1Myr.  Aims: We present the first proper motion measurements of IRS 13N members, andadditionally give proper motions of four of IRS 13E stars resolved in theL'-band.  Methods: The L'-band (3.8 micron) observations have been carried out usingthe NACO adaptive optics system at the ESO VLT. Proper motions have beenobtained by linear fitting of the stellar positions extracted by StarFinder asa function of time, weighted by positional uncertainties.  Results: We show that six of seven resolved northern sources show a commonproper motion, thus revealing a new comoving group of stars in the central halfparsec of the Milky Way. The common proper motions of IRS 13E and IRS 13Nclusters are significantly (>5sigma) different. We also performed a fitting ofthe positional data for those stars onto Keplerian orbits, assuming SgrA* asthe center of the orbit. Our results favor the very young stars hypothesis.

IRS 13N: a new comoving group of sources at the Galactic Center