diff --git a/Gemfile b/Gemfile
index 42bdade..82c4434 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,7 +7,7 @@ ruby '2.5.7'
 
 gem 'rails', '~> 6.0.0'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 3.12'
+gem 'puma', '~> 4.3'
 gem 'sass-rails', '~> 5'
 gem 'webpacker', '~> 5.0'
 gem 'turbolinks', '~> 5'
diff --git a/Gemfile.lock b/Gemfile.lock
index c83c497..6be0ae3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -154,7 +154,8 @@ GEM
     pry-rails (0.3.9)
       pry (>= 0.10.4)
     public_suffix (4.0.1)
-    puma (3.12.6)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     pundit (2.1.0)
       activesupport (>= 3.0.0)
     rack (2.2.3)
@@ -270,7 +271,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   pg (>= 0.18, < 2.0)
   pry-rails
-  puma (~> 3.12)
+  puma (~> 4.3)
   pundit
   rails (~> 6.0.0)
   sass-rails (~> 5)