diff --git a/Gemfile b/Gemfile
index 053e757..26a25a6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ ruby '2.6.3'
 gem 'bootsnap', '>= 1.4.2', require: false
 gem 'jbuilder', '~> 2.7'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'rails', '~> 6.0.0'
 gem 'sass-rails', '~> 5'
 gem 'turbolinks', '~> 5'
diff --git a/Gemfile.lock b/Gemfile.lock
index 3e55f24..fed6963 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -153,7 +153,8 @@ GEM
       ast (~> 2.4.0)
     pg (1.1.4)
     public_suffix (4.0.1)
-    puma (3.12.1)
+    puma (4.3.9)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-protection (2.0.8.1)
       rack
@@ -325,7 +326,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   mail
   pg (>= 0.18, < 2.0)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 6.0.0)
   rails-controller-testing
   rspec-rails