diff --git a/Gemfile b/Gemfile
index 4cb9483..a132af0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 6.0.0'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3', '~> 1.4'
 # Use Puma as the app server
-gem 'puma', '~> 3.7'
+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 a8738d0..81874ce 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -186,7 +186,8 @@ GEM
       i18n (>= 0.5.0)
       railties (>= 3.0.0)
     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
@@ -316,7 +317,7 @@ DEPENDENCIES
   jquery-rails (~> 4.3)
   listen (>= 3.0.5, < 3.2)
   public_activity
-  puma (~> 3.7)
+  puma (~> 4.3)
   rails (~> 6.0.0)
   sass-rails (~> 5)
   selenium-webdriver