diff --git a/docs/Gemfile b/docs/Gemfile
old mode 100755
new mode 100644
index e515a326e45..345f9606296
--- a/docs/Gemfile
+++ b/docs/Gemfile
@@ -3,6 +3,6 @@ source 'https://rubygems.org'
 gem 'uglifier', '3.0.4'
 gem 'jekyll', '2.0.3'
 gem 'jekyll-sitemap', '0.4.1'
-gem 'jekyll-assets'
+gem 'jekyll-assets', '>= 2.0.0'
 gem 'github-markdown'
 gem 'html-pipeline'