Exceptional points (EPs) have emerged as a novel method to enhance the sensitivity of open physical systems, particularly resonant sensors. The authors demonstrate that silicon resonant sensors can be made more sensitive when operated at EPs. They use a pair of mechanically coupled silicon micromechanical resonators, forming a parity-time (PT)-symmetric dimer. Small perturbations on the coupling spring cause the frequency to split from the EPs into the PT-symmetric regime without broadening the spectrum linewidths. The frequency splitting scales with the square root of the perturbation strength, leading to a significant enhancement in sensitivity. Despite a slight increase in noise spectral density, the overall signal-to-noise ratio remains high, making this approach promising for ultrahigh-sensitivity resonant sensors. The study provides a theoretical and experimental foundation for EP-based sensing, with potential applications in accelerometers and magnetometers.Exceptional points (EPs) have emerged as a novel method to enhance the sensitivity of open physical systems, particularly resonant sensors. The authors demonstrate that silicon resonant sensors can be made more sensitive when operated at EPs. They use a pair of mechanically coupled silicon micromechanical resonators, forming a parity-time (PT)-symmetric dimer. Small perturbations on the coupling spring cause the frequency to split from the EPs into the PT-symmetric regime without broadening the spectrum linewidths. The frequency splitting scales with the square root of the perturbation strength, leading to a significant enhancement in sensitivity. Despite a slight increase in noise spectral density, the overall signal-to-noise ratio remains high, making this approach promising for ultrahigh-sensitivity resonant sensors. The study provides a theoretical and experimental foundation for EP-based sensing, with potential applications in accelerometers and magnetometers.