diff --git a/examples/api/Gemfile.lock b/examples/api/Gemfile.lock
index 470cdfa..56b4319 100644
--- a/examples/api/Gemfile.lock
+++ b/examples/api/Gemfile.lock
@@ -20,7 +20,7 @@ GEM
     multipart-post (2.1.1)
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.3)
+    rack (2.2.6.3)
     rack-protection (2.0.8.1)
       rack
     ruby2_keywords (0.0.2)