diff --git a/Gemfile.lock b/Gemfile.lock
index bc1b014..33b4bfa 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -180,7 +180,7 @@ GEM
     popper_js (1.12.9)
     public_suffix (3.0.2)
     puma (3.11.4)
-    rack (2.0.4)
+    rack (2.2.3)
     rack-test (1.0.0)
       rack (>= 1.0, < 3)
     rails (5.2.0)