diff --git a/Gemfile.lock b/Gemfile.lock
index 34f4c9c..8fdde7f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -185,7 +185,7 @@ GEM
     pg (0.21.0)
     popper_js (1.14.5)
     puma (3.10.0)
-    rack (2.0.6)
+    rack (2.1.4)
     rack-pjax (1.0.0)
       nokogiri (~> 1.5)
       rack (>= 1.1)