diff --git a/Gemfile b/Gemfile
index fc9e6ed..caa16f9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ ruby '2.6.0'
 
 gem 'rails', '~> 5.2.2'
 gem 'pg', '~> 1.1.4'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
 gem 'turbolinks', '~> 5'
diff --git a/Gemfile.lock b/Gemfile.lock
index a87e25c..2911fcf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -130,7 +130,8 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (3.0.3)
-    puma (3.12.1)
+    puma (4.3.9)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -251,7 +252,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   pg (~> 1.1.4)
   pry (~> 0.12.2)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 5.2.2)
   rails-i18n (~> 5.1)
   rb-readline (~> 0.5.5)