diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index 7a0980a9e..496a5c034 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -40,9 +40,24 @@ you must set an environment variable such as:
 
     export PUPPET_VERSION="~> 4.2.0"
 
-Install the dependencies like so...
+You can install all needed gems for spec tests into the modules directory by
+running:
 
-    bundle install
+```sh
+bundle install --path .vendor/ --without development --without system_tests --without release
+```
+
+If you also want to run acceptance tests:
+
+```sh
+bundle install --path .vendor/ --without development --with system_tests --without release
+```
+
+Our all in one solution if you don't know if you need to install or update gems:
+
+```sh
+bundle install --path .vendor/ --without development --with system_tests --without release; bundle update; bundle clean
+```
 
 ## Syntax and style
 
diff --git a/.msync.yml b/.msync.yml
index b49c4c69f..964ecbaaa 100644
--- a/.msync.yml
+++ b/.msync.yml
@@ -1 +1 @@
-modulesync_config_version: '1.9.0'
+modulesync_config_version: '1.9.1'
diff --git a/Gemfile b/Gemfile
index 32e6600eb..91457201f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -25,7 +25,7 @@ group :test do
   gem 'redcarpet',                                                  :require => false
   gem 'rubocop', '~> 0.49.1',                                       :require => false if RUBY_VERSION >= '2.3.0'
   gem 'rubocop-rspec', '~> 1.15.0',                                 :require => false if RUBY_VERSION >= '2.3.0'
-  gem 'mocha', '>= 1.2.1',                                          :require => false
+  gem 'mocha', '~> 1.4.0',                                          :require => false
   gem 'coveralls',                                                  :require => false
   gem 'simplecov-console',                                          :require => false
   gem 'rack', '~> 1.0',                                             :require => false if RUBY_VERSION < '2.2.2'