A composite solid rocket propellant comprising a fuel, an oxidizer and a dicyclopentadiene binder is provided. The dicyclopentadiene binder may be mixed with the fuel and oxidizer as a monomer and then polymerized after mixing to form the composite solid propellant. The composite solid propellant may also comprise plasticizers, triphenylphosphine, lecithin or combinations thereof. Methods for making the composite solid rocket propellant of the present invention are also provided.