diff --git a/Gemfile b/Gemfile
index 7c76c9f..1e18591 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 6.0.0'
 # Use sqlite3 as the database for Active Record
 
 # 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 ca77479..931c4d0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -913,7 +913,8 @@ GEM
     pg (1.1.4)
     popper_js (1.14.5)
     public_suffix (4.0.1)
-    puma (3.12.1)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-proxy (0.6.5)
       rack
@@ -1040,7 +1041,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   paperclip (~> 6.0.0)
   pg
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 6.0.0)
   rails_12factor
   sass-rails (~> 5)