diff --git a/Gemfile b/Gemfile
index ca15279..f2b8268 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,7 +7,7 @@ ruby '2.5.3'
 gem 'rails', '~> 6.0.0'
 gem 'pg', '~> 1.1', '>= 1.1.4'
 # Use Puma as the app server
-gem 'puma', '~> 3.12'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5'
 # Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
diff --git a/Gemfile.lock b/Gemfile.lock
index 8b8bcf4..ce7f809 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -94,7 +94,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.12.2)
@@ -104,7 +106,8 @@ GEM
       mini_portile2 (~> 2.4.0)
     pg (1.1.4)
     public_suffix (4.0.1)
-    puma (3.12.6)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-cors (1.0.3)
     rack-test (1.1.0)
@@ -201,7 +204,7 @@ DEPENDENCIES
   jbuilder (~> 2.7)
   listen (>= 3.0.5, < 3.2)
   pg (~> 1.1, >= 1.1.4)
-  puma (~> 3.12)
+  puma (~> 4.3)
   rack-cors (~> 1.0, >= 1.0.3)
   rails (~> 6.0.0)
   sass-rails (~> 5)