diff --git a/Gemfile b/Gemfile
index a5e7446..8ed4daf 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 6.0.0'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5'
 # Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker
diff --git a/Gemfile.lock b/Gemfile.lock
index de84187..96458bb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -130,8 +130,10 @@ GEM
       method_source (~> 0.9.0)
       spoon (~> 0.0)
     public_suffix (4.0.1)
-    puma (3.12.1)
-    puma (3.12.1-java)
+    puma (4.3.12)
+      nio4r (~> 2.0)
+    puma (4.3.12-java)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-proxy (0.6.5)
       rack
@@ -262,7 +264,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   pg (>= 0.18, < 2.0)
   pry (~> 0.12.2)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 6.0.0)
   rspec-rails
   sass-rails (~> 5)