diff --git a/Gemfile b/Gemfile
index 9c207f8..673f026 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 ruby '2.5.1'
 
 gem 'pg', '>= 0.18'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'rails', '~> 5.2.1'
 
 gem 'bcrypt'
diff --git a/Gemfile.lock b/Gemfile.lock
index 1824d29..4be792f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -145,7 +145,9 @@ GEM
     mime-types (3.3)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.1009)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.13.0)
@@ -159,7 +161,8 @@ GEM
       mini_portile2 (~> 2.4.0)
     pg (1.1.4)
     public_suffix (4.0.1)
-    puma (3.12.2)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-accept (0.4.5)
       rack (>= 0.4)
@@ -291,7 +294,7 @@ DEPENDENCIES
   jwt
   listen (>= 3.0.5, < 3.2)
   pg (>= 0.18)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 5.2.1)
   rspec-rails (~> 3.7)
   selenium-webdriver