diff --git a/Gemfile.lock b/Gemfile.lock
index b1f4000..511f879 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -16,7 +16,7 @@ GEM
     mini_portile (0.5.2)
     nokogiri (1.6.0)
       mini_portile (~> 0.5.0)
-    rack (1.5.2)
+    rack (2.1.4)
     rack-test (0.6.2)
       rack (>= 1.0)
     rspec (2.14.1)