2753 20160701171710.0 10.1051/epjconf/20134301004 DOI ASTROimport-910 Grevesse, N. 2013 Why GN93 should not be used anymore We show why the solar chemical composition of [1] (GN93) and the similar values of [2] (AG89) and [3] (GS98), characterized by values of the metallicity of the order of 0.017 to 0.020, largely used in solar and stellar modeling, are now obsolete. They should be replaced by the new and more precise results of [4] (AGSS09), with a much lower metallicity of 0.0134. Asplund, M. Sauval, J. Scott, P. European Physical Journal Web of Conferences 43 2013 01004 http://esoads.eso.org/abs/2013EPJWC..4301004G published in NONREF