diff --git a/YuriKimura/environment/hello_app/Gemfile.lock b/YuriKimura/environment/hello_app/Gemfile.lock
index 4c1cd9a..d9f8668 100644
--- a/YuriKimura/environment/hello_app/Gemfile.lock
+++ b/YuriKimura/environment/hello_app/Gemfile.lock
@@ -89,7 +89,7 @@ GEM
       mini_portile2 (~> 2.6.1)
       racc (~> 1.4)
     public_suffix (4.0.6)
-    puma (4.3.9)
+    puma (4.3.11)
       nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)