Yesterday Google made available Chrome version 43.0.2357.130 for Linux, Mac OS X and Windows. This is a small update which contains fixes for 4 CVEs (2x High severity, 2x Medium severity).
For an explanation of the term CVE, please see the first short aside within this blog post.
Google Chrome updates automatically and will apply the update the next time Chrome is closed and then re-opened. Alternatively Chrome can be updated immediately by clicking the Options button (it looks like 3 stacked small horizontal lines) in the upper right corner of the window and choosing “About Google Chrome” from the menu.
Full details of the update are available in this Google blog post.
While Google Chrome updates generally install without issues, as a routine precaution I would recommend backing up the data on any device for which you are installing updates in order to prevent data loss in the rare event that any update causes unexpected issues.