diff --git a/Gemfile.lock b/Gemfile.lock
index 6433f0e..bf9b274 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -101,7 +101,7 @@ GEM
     padrino-support (0.12.5)
       activesupport (>= 3.1)
     ptools (1.3.3)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-rewrite (1.5.1)
     rack-test (0.6.3)
       rack (>= 1.0)