diff --git a/Gemfile.lock b/Gemfile.lock
index dd25be2..46818c2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GEM
       simplecov (>= 0.7.1, < 1.0.0)
     docile (1.1.5)
     json (1.8.2)
-    rack (1.6.1)
+    rack (1.6.13)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.3)