diff --git a/Gemfile.lock b/Gemfile.lock
index 2e7f742..061af90 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ GEM
   remote: http://rubygems.org/
   specs:
     pdfkit (0.5.2)
-    rack (1.4.1)
+    rack (1.6.11)
     rack-protection (1.2.0)
       rack
     rake (0.9.2.2)