A rubber composition is based on at least an elastomer matrix predominantly comprising a highly saturated diene elastomer, a reinforcing filler, a vulcanization system, and a plasticizing system comprising a hydrocarbon resin having a Tg of between 50 C. and 120 C., an aliphatic proton content of greater than or equal to 95% and a number-average molar mass (Mn) of less than or equal to 800 g/mol; the highly saturated diene elastomer is a copolymer of ethylene and of a 1,3-diene in which the ethylene units represent at least 50 mol % of the monomer units of the copolymer.