diff --git a/Gemfile.lock b/Gemfile.lock
index e768335..4f63efb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     public_suffix (3.1.1)
-    rack (2.2.4)
+    rack (2.2.6.2)
     rack-protection (2.2.0)
       rack
     rouge (2.0.7)