diff --git a/ruby/Gemfile.lock b/ruby/Gemfile.lock
index 3e99421..8aac7c2 100644
--- a/ruby/Gemfile.lock
+++ b/ruby/Gemfile.lock
@@ -3,7 +3,7 @@ GEM
   specs:
     kgio (2.11.3)
     prometheus-client (2.0.0)
-    rack (2.2.3)
+    rack (2.2.6.4)
     raindrops (0.19.1)
     unicorn (5.5.3)
       kgio (~> 2.6)