diff --git a/Gemfile.lock b/Gemfile.lock
index 9ce69a5..3886493 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,7 +6,7 @@ GEM
     dotenv (2.2.1)
     ffi (1.11.1)
     mustermann (1.0.3)
-    rack (2.0.6)
+    rack (2.1.4)
     rack-protection (2.0.2)
       rack
     rack-test (0.8.3)