diff --git a/Gemfile.lock b/Gemfile.lock
index 6c0f874..a517e1b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     kgio (2.9.2)
-    rack (1.6.0)
+    rack (1.6.12)
     rainbows (4.6.2)
       kgio (~> 2.5)
       rack (~> 1.1)