diff --git a/Gemfile.lock b/Gemfile.lock
index fd0ddf7..c06f6af 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -32,7 +32,7 @@ GEM
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.5.8)
-    puma (5.5.2)
+    puma (5.6.4)
       nio4r (~> 2.0)
     rack (2.2.3)
     rack-protection (2.1.0)