diff --git a/Gemfile.lock b/Gemfile.lock
index 2cbb71a..80e26ed 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -66,7 +66,7 @@ GEM
     parser (2.6.3.0)
       ast (~> 2.4.0)
     psych (3.1.0)
-    rack (2.0.8)
+    rack (2.1.4)
     rainbow (3.0.0)
     rake (13.0.1)
     rdoc (6.1.1)