diff --git a/Gemfile b/Gemfile
index 7928620..5146fc9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem 'discard', '~> 1.0' # soft-delete
 gem 'kaminari' # pagination
 gem 'mini_racer', platforms: :ruby
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 4.1'
+gem 'puma', '~> 4.3'
 gem 'rack-cors' # cross domain
 gem 'rails', '~> 6.0.0'
 gem 'react-rails', '~> 2.4'
diff --git a/Gemfile.lock b/Gemfile.lock
index 03d1e6f..1190f16 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -166,7 +166,7 @@ GEM
     pg (1.2.3)
     popper_js (1.16.0)
     public_suffix (4.0.3)
-    puma (4.3.3)
+    puma (4.3.5)
       nio4r (~> 2.0)
     rack (2.2.2)
     rack-cors (1.1.1)
@@ -324,7 +324,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   mini_racer
   pg (>= 0.18, < 2.0)
-  puma (~> 4.1)
+  puma (~> 4.3)
   rack-cors
   rails (~> 6.0.0)
   rails-controller-testing