vagrant-serverspec: Cannot Install With Vagrant 1.9.2

Trying to install vagrant-serverspec with Vagrant 1.9.2 fails with following:

~ ➜ vagrant plugin list
vagrant-share (1.1.7, system)
~ ➜ vagrant plugin install vagrant-serverspec
Installing the 'vagrant-serverspec' plugin. This can take a few minutes...
Bundler, the underlying system Vagrant uses to install plugins,
reported an error. The error is shown below. These errors are usually
caused by misconfigured plugin installations or transient network
issues. The error from Bundler is:

conflicting dependencies nokogiri (~> 1.5.0) and nokogiri (= 1.6.7.1)
  Activated nokogiri-1.6.7.1
  which does not match conflicting dependency (~> 1.5.0)

  Conflicting dependency chains:
    vagrant-share (> 0), 1.1.7 activated, depends on
    vagrant (>= 1.9.2), 1.9.2 activated, depends on
    nokogiri (= 1.6.7.1), 1.6.7.1 activated

  versus:
    vagrant-serverspec (> 0), 1.1.1 activated, depends on
    winrm (>= 1.1.0, ~> 1.1), 1.1.0 activated, depends on
    nokogiri (~> 1.5.0)

System: MacOS X 10.12.3