diff --git a/examples/Gemfile.lock b/examples/Gemfile.lock
index cdf826c..e37eca8 100644
--- a/examples/Gemfile.lock
+++ b/examples/Gemfile.lock
@@ -25,7 +25,7 @@ GEM
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     netrc (0.11.0)
-    rack (2.2.3)
+    rack (2.2.6.4)
     rack-protection (2.1.0)
       rack
     ref (2.0.0)