diff --git a/Gemfile.lock b/Gemfile.lock
index 8717504..cfedd89 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -147,7 +147,7 @@ GEM
       ast (~> 2.4.0)
     pg (1.1.4)
     public_suffix (4.0.6)
-    puma (4.3.9)
+    puma (4.3.12)
       nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)