In this work, we present a technique to control and reduce the residual amplitude modulation (RAM) in the cavitystabilized laser, which is one of the main limitations of these systems. The RAM rises from polarization mismatch between electro-optic modulator (EOM) axis and polarizers implemented for the generation of the error signal by the Pound-Drever-Hall technique. Using digital control system, we have developed a simple and robust technique for an active reduction of the RAM acting on the temperature of the EOM in addition with a DC and high voltage applied accross the EOM crystal. We observe a reduction of the RAM to 0.25 ppm compatible with a fractional frequency stability in the low 1e −16 around 10s.