diff --git a/Gemfile.lock b/Gemfile.lock
index 95b1c74..7bc082a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -83,7 +83,7 @@ GEM
     nokogiri (1.10.2)
       mini_portile2 (~> 2.4.0)
     popper_js (1.14.5)
-    rack (2.0.6)
+    rack (2.2.1)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.3)