diff --git a/Gemfile.lock b/Gemfile.lock
index a48a4c5..92855be 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -74,7 +74,7 @@ GEM
     nio4r (2.3.1)
     nokogiri (1.8.3)
       mini_portile2 (~> 2.3.0)
-    rack (2.0.5)
+    rack (2.2.3)
     rack-test (1.0.0)
       rack (>= 1.0, < 3)
     rails (5.2.0)