diff --git a/Gemfile b/Gemfile
index 03d2056..62aab80 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 ruby '2.6.5'
 
 gem 'rails', '~> 6.0.0'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'sass-rails', '~> 5'
 gem 'webpacker', '~> 4.0'
 gem 'jbuilder', '~> 2.7'
diff --git a/Gemfile.lock b/Gemfile.lock
index 775ab80..8bfa2d2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -235,7 +235,9 @@ GEM
       rack-contrib (>= 1.1, < 3)
       railties (>= 3.0.0, < 7)
     method_source (0.9.2)
-    mimemagic (0.3.4)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.14.0)
@@ -273,8 +275,10 @@ GEM
     pry-rails (0.3.9)
       pry (>= 0.10.4)
     public_suffix (4.0.3)
-    puma (3.12.2)
-    puma (3.12.2-java)
+    puma (4.3.12)
+      nio4r (~> 2.0)
+    puma (4.3.12-java)
+      nio4r (~> 2.0)
     rack (2.1.2)
     rack-contrib (2.1.0)
       rack (~> 2.0)
@@ -479,7 +483,7 @@ DEPENDENCIES
   meta_request
   pg
   pry-rails
-  puma (~> 3.11)
+  puma (~> 4.3)
   rack-timeout
   rails (~> 6.0.0)
   rails_12factor