diff --git a/Gemfile.lock b/Gemfile.lock
index 9f233e1..fb36da2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -66,7 +66,7 @@ GEM
       rack (>= 1.2, < 3)
     psych (2.2.4)
     public_suffix (4.0.5)
-    rack (2.2.3)
+    rack (2.2.6.4)
     rake (13.0.1)
     rchardet (1.8.0)
     rdoc (6.2.1)