Kim, S.H. Bice, D.J. Chang, W. Contreras-Martinez, C. Elliott, K. Eremeev, G.V. Guilfoyle, B.M. Hartung, W. Kelly, M.P. McGee, K.E. Metzgar, E.S. Ostroumov, P.N. Pischalnikov, Y.M. Popielarski, L. Rathke, J. Reid, T. Xu, T. Zhao, S. JACoW Publishing Geneva, Switzerland Michigan State University is pursuing SRF R&D for FRIB400 upgrade, doubling the FRIB linac beam energy (400 MeV/u for the heaviest uranium beam) using ßopt=0.65 644 MHz 5-cell elliptical cavities. We have achieved unprecedented Q₀ in this cavity class, Q₀ = 3.5·10¹0 at E_{acc} of 17.5 MV/m in a nitrogen-doped bare niobium cavity in collaboration with FNAL and ANL. The next missions are achieving such high Q₀ in jacketed cavities and in cryomodules, achieving field-emission free performance at Epeak of 40 MV/m with reproducibility, developing a compact two-window high-power fundamental power coupler (15 kW CW), and achieving stable resonance control of cavities integrated with tuners in cryomodules. In this talk, we will present progress of the SRF R&D and discuss future plan.