Getting started with salt-stack – Version Numbers

As of Salt version 2014.1.0, Salt uses a date based system for version numbers. Version numbers are in the format YYYY.MM.R. The year (YYYY) and month (MM) indicate when the release was created. The bugfix release number (R) increments within that feature release.

In order to distinguish future releases from the current release, code names are used. Salt uses the periodic table to derive the next codename. The first release in the date based system was code name Hydrogen, each subsequent release will go to the next atomic release.

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Getting started with salt-stack – Version Numbers - CodeDay