diff --git a/Gemfile.lock b/Gemfile.lock
index 2122858..a609b06 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -140,7 +140,7 @@ GEM
     padrino-support (0.12.9)
       activesupport (>= 3.1)
     pmap (1.1.1)
-    puma (3.12.0)
+    puma (3.12.4)
     rack (1.6.10)
     rack-contrib (1.4.0)
       git-version-bump (~> 0.15)