If this is as high as it is getting, then you are perfectly fine. You could go through the process of removing your heatsink and reapplying new Thermal Interface Material (TIM, a.k.a. grease, goop, paste, etc.), but you likely won't drop the high temperature that much. What temperatures are you seeing at idle? If it is around 40c (or lower), then replacing the TIM probably won't accomplish anything.
Hope this helps,