diff --git a/Gemfile.lock b/Gemfile.lock
index b6ce8da..a87bf55 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -68,7 +68,7 @@ GEM
     mustermann-grape (1.0.0)
       mustermann (~> 1.0.0)
     pg (1.1.4)
-    rack (2.2.3)
+    rack (2.2.3.1)
     rack-accept (0.4.5)
       rack (>= 0.4)
     rack-test (1.1.0)