diff --git a/Gemfile.lock b/Gemfile.lock
index 631fbab..5170290 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -45,7 +45,7 @@ GEM
       byebug (~> 10.0)
       pry (~> 0.10)
     public_suffix (3.0.3)
-    rack (2.2.2)
+    rack (2.2.3.1)
     rainbow (3.0.0)
     rake (13.0.1)
     rspec (3.8.0)