diff --git a/Gemfile.lock b/Gemfile.lock
index fa6ef1a..d56ec14 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -39,7 +39,7 @@ GEM
     minitest (5.11.3)
     nokogiri (1.8.5)
       mini_portile2 (~> 2.3.0)
-    rack (2.0.6)
+    rack (2.2.3)
     rack-cors (1.0.2)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)