diff --git a/Gemfile.lock b/Gemfile.lock
index 7e15336..837f724 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -63,7 +63,7 @@ GEM
     psych (2.2.4-java)
       jar-dependencies (>= 0.1.7)
     public_suffix (4.0.6)
-    rack (2.2.3)
+    rack (2.2.6.4)
     rake (13.0.3)
     rchardet (1.8.0)
     rdoc (6.3.0)