diff --git a/Gemfile.lock b/Gemfile.lock
index 0316759..01b96fa 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -5,7 +5,7 @@ GEM
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.7.0)
-    puma (6.4.0)
+    puma (6.4.2)
       nio4r (~> 2.0)
     rack (2.2.8)
     rack-protection (3.1.0)