diff --git a/Gemfile b/Gemfile
index 0d53711..66b656f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,3 +11,4 @@ gem 'rubypants'
 gem 'nokogiri'
 gem 'builder'
 gem 'fssm'
+gem 'systemu'
diff --git a/Gemfile.lock b/Gemfile.lock
index fd14f41..a6d102b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -38,6 +38,7 @@ GEM
     rdiscount (1.6.8)
     rubypants (0.2.0)
     sass (3.2.1)
+    systemu (2.5.2)
 
 PLATFORMS
   ruby
@@ -54,3 +55,4 @@ DEPENDENCIES
   rdiscount
   rubypants
   sass
+  systemu