diff --git a/Gemfile.lock b/Gemfile.lock
index c458744..af1a28e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -43,7 +43,7 @@ GEM
       byebug (~> 10.0)
       pry (~> 0.10)
     public_suffix (3.0.3)
-    rack (2.0.5)
+    rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rake (10.5.0)