diff --git a/Gemfile.lock b/Gemfile.lock
index b72d2e6..269666e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -79,7 +79,7 @@ GEM
       activesupport (>= 3.1)
     parallel (1.13.0)
     public_suffix (3.0.3)
-    rack (2.0.8)
+    rack (2.2.3)
     rake (12.3.2)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.0)