diff --git a/example/Gemfile.lock b/example/Gemfile.lock
index 3da3f0b..7e44068 100644
--- a/example/Gemfile.lock
+++ b/example/Gemfile.lock
@@ -99,7 +99,7 @@ GEM
       padrino-core (= 0.15.3)
     padrino-support (0.15.3)
     public_suffix (5.0.1)
-    rack (2.2.6.4)
+    rack (2.2.9)
     rack-protection (2.2.4)
       rack
     rake (12.3.3)