2.68.1 is used because that’s the system preinstalled version on the Xcode 9.2 stack. It was upgraded when the Xcode 9.2 final stack was created (the betas had a lower one).
From the log:
e[34;1mUsing system installed Fastlanee[0m
e[34;1mFastlane version:e[0m
e[32;1m$ fastlane "--version"e[0m
fastlane installation at path:
/usr/local/lib/ruby/gems/2.4.0/gems/fastlane-2.68.1/bin/fastlane
-----------------------------
fastlane 2.68.1
So the step is correct, it does not upgrade the fastlane version, 2.68.1 is the preinstalled on the Xcode 9.2 stack. Related changelog: Xcode 9.2 final is now available!
To use a specific fastlane version please see: How to use a specific version of fastlane?
If you’d have any questions just let us know! 