diff --git a/Gemfile.lock b/Gemfile.lock
index 99f9550..888efac 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -43,7 +43,7 @@ GEM
     parser (2.7.0.2)
       ast (~> 2.4.0)
     public_suffix (4.0.3)
-    rack (2.1.2)
+    rack (3.0.4.1)
     rainbow (3.0.0)
     rake (10.5.0)
     rspec (3.7.0)