diff --git a/Gemfile b/Gemfile
index 4e1c94c..626dcb5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -24,7 +24,7 @@ gem 'rails', '~> 5.2.3'
 gem 'pg'
 gem 'seed_dump'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+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 09aaafd..139fbe7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -127,7 +127,9 @@ GEM
     mime-types (3.2.2)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.0331)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.14.0)
@@ -158,7 +160,8 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     public_suffix (4.0.1)
-    puma (3.12.2)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     rack (2.1.1)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -267,7 +270,7 @@ DEPENDENCIES
   omniauth-facebook
   pg
   pry
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 5.2.3)
   rest-client
   sass-rails (~> 5.0)