diff --git a/examples/cors/Gemfile.lock b/examples/cors/Gemfile.lock
index e7e29aa..509b359 100644
--- a/examples/cors/Gemfile.lock
+++ b/examples/cors/Gemfile.lock
@@ -19,7 +19,7 @@ GEM
     nokogiri (1.10.7)
       mini_portile2 (~> 2.4.0)
     public_suffix (4.0.1)
-    rack (1.6.11)
+    rack (1.6.12)
     rack-cors (1.0.6)
       rack (>= 1.6.0)
     rack-protection (1.5.5)