diff --git a/Gemfile.lock b/Gemfile.lock
index 38a361c..57da12d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -20,7 +20,7 @@ GEM
     pygments.rb (0.3.7)
       posix-spawn (~> 0.3.6)
       yajl-ruby (~> 1.1.0)
-    rake (10.0.4)
+    rake (12.3.3)
     rdiscount (1.6.8)
     rmagick (2.13.2)
     syntax (1.0.0)