diff --git a/Gemfile.lock b/Gemfile.lock
index e363828..80a445b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,7 +10,7 @@ GEM
     mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
     newrelic_rpm (8.3.0)
-    rack (2.2.6.4)
+    rack (2.2.8.1)
     rack-protection (2.2.3)
       rack
     rack-test (1.1.0)