A small but important incremental update to Chrome OS has been released by the Chromium team for a wide range of devices. The update is build 57.0.2987.146 (Platform version: 9202.64.0) and it has been released for the same set of devices of the last update to the platform back on March 30th. The devices that won’t see this update are as follows: AOpen Chromebase Mini, AOpen Chromebox Mini, Google Chromebook Pixel (2015), ASUS Chromebook Flip C100PA, Samsung Chromebook Plus, Acer Chromebook R11 (CB5-132T / C738T) and HP Chromebook 14.
The update addresses a handful security bugs in the platform and other performance updates. The exact details of what is fixed or addressed in this update has not been released by Google yet. This is a common practice by the Chrome OS team until a majority of eligible devices have been updated. They don’t want to have devices exploited in the interim.
If you have a Chromebook or other Chrome device that is not on the list above, you should see the update come to you over the course of the next few days. You can always force the update by typing chrome://help in the browser and click the Check for update button. The update, based on my Acer Chromebook 14, is small and shouldn’t take more than a few minutes to install. It will however require a reboot of your device.