diff --git a/Gemfile.lock b/Gemfile.lock
index 1e54ff9..39d27ae 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,7 +4,7 @@ GEM
     eventmachine (0.12.10)
     json (1.4.6)
     macaddr (1.0.0)
-    rack (1.2.1)
+    rack (2.1.4)
     uuid (2.3.1)
       macaddr (~> 1.0)