My boss is trying to minimize my job exposure because I am outshining him. What is the proper thing to do?

I have been an outstanding performer in work (Corporate Finance) and I am able to report to the President and COO on certain projects. My boss wants all the attention so he tries to make it seem that I am doing a very small role in the projects, even if I am the one who does everything from start to finish. I really need some great advice.