diff --git a/Gemfile.lock b/Gemfile.lock
index 45d739e..33710a5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -177,7 +177,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (3.0.2)
-    rack (1.6.9)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rack_session_access (0.2.0)