ation; and every 8-edge-connected graph G is Z3-connected and aIt was proved recently by Thomassen that, for every odd number k⩾3, every (2k2+k)-edge-connected graph G has a modulo k-orientdmits therefore a nowhere-zero 3-flow. In the present paper, Thomassenʼs method is refined to prove the following: For every odd number k⩾3, every (3k−3)-edge-connected graph has a modulo k-orientation. As a special case of the main result, every6-edge-connected graph is Z3-connected and admits therefore a nowhere-zero 3-flow.