diff --git a/Gemfile.lock b/Gemfile.lock
index a889593..dc5585f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -139,7 +139,7 @@ GEM
       activesupport (>= 3.1)
     parallel (1.12.1)
     public_suffix (3.0.2)
-    rack (2.0.5)
+    rack (2.2.3)
     rack-livereload (0.3.17)
       rack
     rake (12.3.1)