diff --git a/Gemfile.lock b/Gemfile.lock
index ff92c3f..7cba431 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -73,7 +73,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    rack (1.6.4)
+    rack (2.2.3)
     rainpress (1.0)
     rake (11.2.2)
     rb-fsevent (0.9.5)