PS C:\Users\Landon Abney> gem update
Updating installed gems
Updating github_changelog_generator
Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
ERROR:  Error installing github_changelog_generator:
        ERROR: Failed to build gem native extension.

    C:/Ruby22-x64/bin/ruby.exe -rubygems C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rake-10.5.0/bin/rake RUBYARCHDIR=C:/Ruby22-x64/lib/ruby/gems/2.2.0/extensions/x64-mingw32/2.2.0/github_changelog_generator-1.11.7 RUBYLIBDIR=C:/Ruby22-x64/lib/ruby/gems/2.2.0/extensions/x64-mingw32/2.2.0/github_changelog_generator-1.11.7
rake aborted!
Bundler::GemspecError: There was a Errno::ENOENT while loading github_changelog_generator.gemspec:
No such file or directory - git ls-files -z from
  C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/github_changelog_generator-1.11.7/github_changelog_generator.gemspec:21:in ``'

Errno::ENOENT: No such file or directory - git ls-files -z

(See full trace by running task with --trace)

rake failed, exit code 1

Gem files will remain installed in C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/github_changelog_generator-1.11.7 for inspection.
Results logged to C:/Ruby22-x64/lib/ruby/gems/2.2.0/extensions/x64-mingw32/2.2.0/github_changelog_generator-1.11.7/gem_make.out
Gems updated: github_changelog_generator