See the readme file for instructions on updating Firmata.
For Arduino 1.8.x or 1.6.4 and newer, simply update via the Arduino library manager.
If you're using Arduino 1.6.3 or older (including the 1.0.x series) you'll need to download the attached file below for your version (Firmata-2.5.7.zip for v1.8.x, v1.6.x and 1.5.x or Arduino-1.0.x-Firmata-2.5.7.zip for v1.0.x) and update following these instructions.
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