diff --git a/scaffolds/ruby/Gemfile.lock b/scaffolds/ruby/Gemfile.lock
index 5fdc55b..3919211 100644
--- a/scaffolds/ruby/Gemfile.lock
+++ b/scaffolds/ruby/Gemfile.lock
@@ -9,7 +9,7 @@ GEM
       builder
       minitest (>= 5.0)
       ruby-progressbar
-    rack (2.2.6.2)
+    rack (2.2.6.4)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rake (13.0.6)