diff --git a/Gemfile.lock b/Gemfile.lock
index f833f08d6..01f824580 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -189,7 +189,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (4.0.1)
-    puma (4.2.1)
+    puma (4.3.1)
       nio4r (~> 2.0)
     rack (2.0.7)
     rack-cache (1.10.0)