diff --git a/Gemfile.lock b/Gemfile.lock
index df48569..f43b2d8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -30,7 +30,7 @@ GEM
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.1)
-    rack (1.6.12)
+    rack (2.1.4)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.0)
       ffi (~> 1.0)