diff --git a/website/docs/Gemfile b/website/docs/Gemfile
index 4a2399f5d..3534fecfc 100644
--- a/website/docs/Gemfile
+++ b/website/docs/Gemfile
@@ -1,5 +1,7 @@
 source "https://rubygems.org"
 
+ruby "2.2.2"
+
 gem "less", "~> 2.2.2"
 gem "middleman", "~> 3.0.6"
 gem "middleman-minify-html", "~> 3.0.0"
diff --git a/website/www/Gemfile b/website/www/Gemfile
index eea83f62c..17c572101 100644
--- a/website/www/Gemfile
+++ b/website/www/Gemfile
@@ -1,5 +1,7 @@
 source 'https://rubygems.org'
 
+ruby "2.2.2"
+
 gem "builder", "~> 3.2.2"
 gem "less", "~> 2.2.2"
 gem "middleman", "~> 3.1.5"