diff --git a/Gemfile.lock b/Gemfile.lock
index d88d095..36f95ba 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -5,7 +5,7 @@ GEM
     eventmachine (1.2.5)
     jwt (2.1.0)
     mustermann (1.0.2)
-    rack (2.0.4)
+    rack (2.2.3)
     rack-protection (2.0.1)
       rack
     sinatra (2.0.1)