diff --git a/Gemfile.lock b/Gemfile.lock
index 7e95396..29065a0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -23,7 +23,7 @@ GEM
     multi_json (1.14.1)
     mustermann (1.0.3)
     mysql2 (0.5.2)
-    rack (2.0.7)
+    rack (2.2.3)
     rack-protection (2.0.7)
       rack
     rack-test (1.1.0)