diff --git a/Gemfile b/Gemfile
index f52586b..26cef99 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ ruby '2.6.5'
 
 gem 'coffee-rails', '~> 4.2'
 gem 'jbuilder', '~> 2.5'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'rails', '~> 5.2.4', '>= 5.2.4.2'
 gem 'sass-rails', '~> 5.0'
 gem 'turbolinks', '~> 5'
diff --git a/Gemfile.lock b/Gemfile.lock
index f007a16..04591bc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -121,7 +121,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (1.0.0)
-    mimemagic (0.3.5)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.14.1)
@@ -133,7 +135,8 @@ GEM
     pg (0.20.0)
     popper_js (1.16.0)
     public_suffix (4.0.5)
-    puma (3.12.6)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -271,7 +274,7 @@ DEPENDENCIES
   jsonapi-rb (~> 0.5.0)
   listen (>= 3.0.5, < 3.2)
   pg (= 0.20.0)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 5.2.4, >= 5.2.4.2)
   rails-controller-testing
   rspec-rails (~> 4.0)