diff --git a/Gemfile.lock b/Gemfile.lock
index 5238f63..8eb62f6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -71,7 +71,7 @@ GEM
     psych (5.1.0)
       stringio
     racc (1.8.1)
-    rack (2.2.6.4)
+    rack (2.2.8.1)
     rainbow (3.1.1)
     rake (13.0.1)
     rchardet (1.8.0)