diff --git a/Gemfile b/Gemfile
index fb2558c..2f3241c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ ruby '2.5.3'
 
 gem 'rails', '~> 5.2.1'
 gem 'sqlite3'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'bootsnap', '>= 1.1.0', require: false
 gem 'rack-cors', require: 'rack/cors'
 gem 'responders'
diff --git a/Gemfile.lock b/Gemfile.lock
index 6e04e13..c268d5a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -81,7 +81,9 @@ 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 (5.11.3)
@@ -91,7 +93,8 @@ GEM
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
     public_suffix (3.1.1)
-    puma (3.12.1)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-cors (1.0.3)
     rack-test (1.1.0)
@@ -187,7 +190,7 @@ DEPENDENCIES
   byebug
   httparty
   listen (>= 3.0.5, < 3.2)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rack-cors
   rails (~> 5.2.1)
   responders