diff --git a/Gemfile.lock b/Gemfile.lock
index 799bd07..4f1eae2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -107,7 +107,7 @@ GEM
     parallel (1.12.1)
     popper_js (1.12.9)
     public_suffix (3.0.2)
-    rack (2.0.4)
+    rack (2.2.3)
     rack-livereload (0.3.17)
       rack
     rails-assets-jquery (3.3.1)