diff --git a/Gemfile.lock b/Gemfile.lock
index 45fba45..a0abcf8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -49,7 +49,7 @@ GEM
       method_source (~> 0.8)
       slop (~> 3.4)
       win32console (~> 1.3)
-    rack (1.5.2)
+    rack (1.6.13)
     rack-codehighlighter (0.5.0)
       nokogiri (>= 1.4.1)
       rack (>= 1.0.0)