diff --git a/Gemfile b/Gemfile
index a989c85..6f2cfb3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ gem 'rails', '~> 5.2.4', '>= 5.2.4'
 # Use mysql as the database for Active Record
 gem 'mysql2', '>= 0.4.4', '< 0.5'
 # Use Puma as the app server
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/Gemfile.lock b/Gemfile.lock
index 9bcbbdf..3889866 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -140,7 +140,9 @@ GEM
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2020.0425)
-    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)
@@ -159,7 +161,8 @@ GEM
     nokogiri (1.10.9-x64-mingw32)
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
-    puma (3.12.4)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     rack (2.2.2)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -289,7 +292,7 @@ DEPENDENCIES
   mailgun_rails
   mysql2 (>= 0.4.4, < 0.5)
   nokogiri
-  puma (~> 3.0)
+  puma (~> 4.3)
   rails (~> 5.2.4, >= 5.2.4)
   recaptcha
   rollbar