diff --git a/Gemfile.lock b/Gemfile.lock
index 783ee09..44ab519 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -45,7 +45,7 @@ GEM
     multi_json (1.3.6)
     multi_xml (0.5.5)
     nokogiri (1.5.5)
-    rack (1.4.1)
+    rack (2.0.8)
     rack-test (0.6.1)
       rack (>= 1.0)
     rake (0.9.2.2)