The current msysgit version I'm using is 188.8.131.52 (powered by Git-184.108.40.206-preview20091022.exe).
I'm eager to update the latest one, but there is no update release at the official website.
Here this tweet is not useful to find a good news...
See also (in Japanese)
about previous updates of msysgit:
Fortunately, I found how to update MSysGit as follows:
Together with Git for Windows, the build environment msysGit advances, too. If you want to stay on top of those developments, just use Git itself.404 Not Found - UpdatingMSysGit - msysgit - Git for Windows - Google Project Hosting