We announce the release of  new, updated version of A4MEMS, our 3-channel high-voltage amplifier for quick MEMS prototyping.  This unit is capable of driving capacitive loads in a wide frequency range and is indispensable tool for operating various types of electrostatic and piezoelectric actuators. In the new version we have significantly improved the frequency response of the amplifier gain, extending the operational regime up to 2 kHz for 4 nF load, along with the other usability enhancements. For details see the corresponding article.