diff --git a/Gemfile.lock b/Gemfile.lock
index 0c52fcd..6cdba14 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -12,7 +12,7 @@ GEM
     mini_portile2 (2.3.0)
     nokogiri (1.8.2)
       mini_portile2 (~> 2.3.0)
-    rack (2.0.4)
+    rack (2.2.3)
     rake (10.5.0)
     rspec (3.7.0)
       rspec-core (~> 3.7.0)