diff --git a/Gemfile.lock b/Gemfile.lock
index 7bb8153..f955a82 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -21,7 +21,7 @@ GEM
     fssm (0.2.9)
     haml (3.1.7)
     posix-spawn (0.3.6)
-    rack (1.4.1)
+    rack (1.6.13)
     rack-gauges (1.1.0)
     rack-protection (1.2.0)
       rack