diff --git a/Gemfile.lock b/Gemfile.lock
index d2f6e4f..bc5d898 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -89,7 +89,7 @@ GEM
     origin (2.1.1)
     pg (0.18.3)
     pg (0.18.3-x86-mingw32)
-    rack (1.6.11)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.3)