diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index 5d04747..38cacd4 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -51,19 +51,34 @@ You can install all needed gems for spec tests into the modules directory by
 running:
 
 ```sh
-bundle install --path .vendor/ --without development system_tests release
+bundle install --path .vendor/ --without development system_tests release --jobs "$(nproc)"
 ```
 
 If you also want to run acceptance tests:
 
 ```sh
-bundle install --path .vendor/ --with system_tests --without development release
+bundle install --path .vendor/ --with system_tests --without development release --jobs "$(nproc)"
 ```
 
 Our all in one solution if you don't know if you need to install or update gems:
 
 ```sh
-bundle install --path .vendor/ --with system_tests --without development release; bundle update; bundle clean
+bundle install --path .vendor/ --with system_tests --without development release --jobs "$(nproc)"; bundle update; bundle clean
+```
+
+As an alternative to the `--jobs "$(nproc)` parameter, you can set an
+environment variable:
+
+```sh
+BUNDLE_JOBS="$(nproc)"
+```
+
+### Note for OS X users
+
+`nproc` isn't a valid command unter OS x. As an alternative, you can do:
+
+```sh
+--jobs "$(sysctl -n hw.ncpu)"
 ```
 
 ## Syntax and style
@@ -160,7 +175,7 @@ created virtual machines will be in `.vagrant/beaker_vagrant_files`.
 Beaker also supports docker containers. We also use that in our automated CI
 pipeline at [travis-ci](http://travis-ci.org). To use that instead of Vagrant:
 
-```
+```sh
 PUPPET_INSTALL_TYPE=agent BEAKER_IS_PE=no BEAKER_PUPPET_COLLECTION=puppet5 BEAKER_debug=true BEAKER_setfile=debian9-64{hypervisor=docker} BEAKER_destroy=yes bundle exec rake beaker
 ```
 
diff --git a/.msync.yml b/.msync.yml
index 5519891..23dfa32 100644
--- a/.msync.yml
+++ b/.msync.yml
@@ -1 +1 @@
-modulesync_config_version: '2.7.0'
+modulesync_config_version: '2.8.0'
diff --git a/Gemfile b/Gemfile
index 24dbb7f..9571ef3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -21,6 +21,7 @@ group :test do
   gem 'puppet-lint-unquoted_string-check',                          :require => false
   gem 'puppet-lint-variable_contains_upcase',                       :require => false
   gem 'puppet-lint-absolute_classname-check',                       :require => false
+  gem 'puppet-lint-topscope-variable-check',                        :require => false
   gem 'metadata-json-lint',                                         :require => false
   gem 'redcarpet',                                                  :require => false
   gem 'rubocop', '~> 0.49.1',                                       :require => false
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index c53e703..f16fb15 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -7,6 +7,7 @@
 
 require 'puppetlabs_spec_helper/module_spec_helper'
 require 'rspec-puppet-facts'
+require 'bundler'
 include RspecPuppetFacts
 
 if File.exist?(File.join(__dir__, 'default_module_facts.yml'))
@@ -31,6 +32,7 @@
     add_filter '/spec'
     add_filter '/vendor'
     add_filter '/.vendor'
+    add_filter Bundler.configured_bundle_path.path
   end
 end