diff --git a/Gemfile b/Gemfile
index 94e0198..98fd26f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,6 @@
 source 'https://rubygems.org'
 
+gem "rake"
 gem "jekyll", "~>2.5.3"
 gem "coderay", "~>1.0.0"
 gem "kramdown"
diff --git a/Gemfile.lock b/Gemfile.lock
index 81fa50f..bc54f15 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -52,6 +52,7 @@ GEM
     pygments.rb (0.6.0)
       posix-spawn (~> 0.3.6)
       yajl-ruby (~> 1.1.0)
+    rake (10.4.2)
     rb-fsevent (0.9.4)
     rb-inotify (0.9.5)
       ffi (>= 0.5.0)
@@ -71,3 +72,4 @@ DEPENDENCIES
   coderay (~> 1.0.0)
   jekyll (~> 2.5.3)
   kramdown
+  rake