diff --git a/Gemfile.lock b/Gemfile.lock
index d7e1f8a..f4abb6f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    rack (1.6.12)
+    rack (2.1.4)
     rack-test (0.6.2)
       rack (>= 1.0)