diff --git a/Gemfile.lock b/Gemfile.lock
index f97876f..91c4c89 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -111,7 +111,7 @@ GEM
     popper_js (1.12.9)
     public_suffix (3.0.2)
     puma (3.11.2)
-    rack (2.0.4)
+    rack (2.1.4)
     rack-test (0.8.2)
       rack (>= 1.0, < 3)
     rails (5.1.5)