diff --git a/Gemfile.lock b/Gemfile.lock
index 1f51dad..4ce1442 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -123,7 +123,7 @@ GEM
     parallel (1.17.0)
     popper_js (1.14.5)
     public_suffix (3.1.1)
-    rack (2.0.7)
+    rack (2.2.3)
     rack-livereload (0.3.17)
       rack
     rack-test (0.6.3)