diff --git a/Gemfile b/Gemfile
old mode 100644
new mode 100755
index dcb653a..0898b7f
--- a/Gemfile
+++ b/Gemfile
@@ -3,4 +3,5 @@ gem 'github-pages', group: :jekyll_plugins
 gem 'jekyll-toc', group: :jekyll_plugins
 gem 'jekyll-feed', group: :jekyll_plugins
 gem 'jekyll-paginate', group: :jekyll_plugins
+gem 'jekyll-sitemap', group: :jekyll_plugins
 gem 'therubyracer', group: :jekyll_plugins