Version 9.22.0.0
Maybe it works for the 64 bit version, the 32 bit version updated on my x86 laptop, but when I checked 7-Zip itself it claimed to be a beta. So I reinstalled the stable release 7-Zip from the installer.
Maybe you should check whether yours is the beta or not. It probably doesn't matter though, it appears however that development of 7-Zip has halted for a while.
Wiki:
Initial release 18 July 1999[1]
Stable release 9.20 (November 18, 2010; 3 years ago) [±][1]
Preview release
9.22 beta (April 18, 2011; 3 years ago) [±][2]
9.34 alpha (June 22, 2014; 23 days ago) [±][2]