diff --git a/Gemfile.lock b/Gemfile.lock
index 7f5a4e68..680e8037 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -399,7 +399,7 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     public_suffix (4.0.6)
-    puma (4.3.8)
+    puma (4.3.9)
       nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)