The Librem's have a version that I think represents the physical device on the back, one of my Librems says "Librem 13, version 3." If you want to find the software version, or version of the overall OS, try this command (you may have to install inxi);
Which on my system produces;
You can see from output above that I'm running a 4.18 kernel. My distro is PureOS based on Debian Buster / Sid (so testing) and that my repos are PureOS 'green' mixed with Debian stretch. In the "Machine:" line I note that coreboot version is 4.78-Purism-4 from 03/20/2018. PureOS "green" may be a rolling release which means that the userland packages (and kernel potentially) are updated continually.