diff --git a/SeiyaTaninaka/environment/hello_app/Gemfile b/SeiyaTaninaka/environment/hello_app/Gemfile
index 08bb23a..924c445 100644
--- a/SeiyaTaninaka/environment/hello_app/Gemfile
+++ b/SeiyaTaninaka/environment/hello_app/Gemfile
@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 
 gem 'rails',        '5.1.6'
-gem 'puma',         '4.3.9'
+gem 'puma',         '4.3.11'
 gem 'sass-rails',   '5.0.6'
 gem 'uglifier',     '3.2.0'
 gem 'coffee-rails', '4.2.2'
diff --git a/SeiyaTaninaka/environment/hello_app/Gemfile.lock b/SeiyaTaninaka/environment/hello_app/Gemfile.lock
index a322eb3..67b8937 100644
--- a/SeiyaTaninaka/environment/hello_app/Gemfile.lock
+++ b/SeiyaTaninaka/environment/hello_app/Gemfile.lock
@@ -82,11 +82,11 @@ GEM
     minitest (5.11.3)
     msgpack (1.3.0)
     multi_json (1.13.1)
-    nio4r (2.4.0)
+    nio4r (2.5.8)
     nokogiri (1.12.5)
       mini_portile2 (~> 2.6.1)
       racc (~> 1.4)
-    puma (4.3.9)
+    puma (4.3.11)
       nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.0.7)
@@ -173,7 +173,7 @@ DEPENDENCIES
   jbuilder (= 2.6.4)
   jquery-rails (= 4.3.1)
   listen (= 3.1.5)
-  puma (= 4.3.9)
+  puma (= 4.3.11)
   rails (= 5.1.6)
   sass-rails (= 5.0.6)
   spring (= 2.0.2)