diff --git a/Gemfile.lock b/Gemfile.lock
index f65697a..12dcda8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -35,7 +35,7 @@ GEM
     mustache (1.1.1)
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
-    rack (2.0.8)
+    rack (2.2.3)
     rack-protection (2.0.8.1)
       rack
     ruby2_keywords (0.0.1)