diff --git a/Gemfile.lock b/Gemfile.lock
index 72a2422..9d7861b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,7 +9,7 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.10)
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.2)
+    rack (2.2.3)
     rack-protection (2.0.8.1)
       rack
     rb-fsevent (0.10.3)