diff --git a/Gemfile.lock b/Gemfile.lock
index 39412a2..8f2babc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -68,7 +68,7 @@ GEM
       method_source (~> 0.8.1)
       slop (~> 3.4)
     public_suffix (3.0.0)
-    rack (2.0.3)
+    rack (2.2.3)
     rb-fsevent (0.10.2)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)