diff --git a/Gemfile.lock b/Gemfile.lock
index a230bda..f995f2a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -14,7 +14,7 @@ GEM
     minitest (5.11.3)
     multi_json (1.13.1)
     mustermann (1.0.3)
-    puma (3.12.0)
+    puma (3.12.6)
     rack (2.0.6)
     rack-protection (2.0.4)
       rack