diff --git a/Gemfile b/Gemfile
index 55e181e..39d77d0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ git_source(:github) { |repo| 'https://github.com/#{repo}.git' }
 ruby '2.6.3'
 gem 'rails', '~> 5.2.3'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
 gem 'coffee-rails', '~> 4.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index 998fc40..36a5cf0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -155,7 +155,8 @@ GEM
       virtus
     pg (1.1.4)
     public_suffix (3.1.1)
-    puma (3.12.1)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     raabro (1.1.6)
     rack (2.0.7)
     rack-cors (1.0.3)
@@ -307,7 +308,7 @@ DEPENDENCIES
   paperclip
   peafowl
   pg (>= 0.18, < 2.0)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rack-cors
   rails (~> 5.2.3)
   react_on_rails (= 11.1.4)