diff --git a/Gemfile b/Gemfile
old mode 100755
new mode 100644
index ce5454eaf..4d61a051e
--- a/Gemfile
+++ b/Gemfile
@@ -18,7 +18,7 @@ group :jekyll_plugins do
   gem 'jekyll-redirect-from'
   #gem 'jekyll-paginate-v2', "2.0"  
   gem 'jekyll-sitemap'
-  gem 'jekyll-last-modified-at'
+  gem 'jekyll-last-modified-at', '>= 1.3.2'
   gem 'pagemaster'
   # gem 'jekyll_pages_api_search'
 end