diff --git a/Gemfile.lock b/Gemfile.lock
index 0db4d2e..59b12e8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ 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
     rack-test (1.1.0)