diff --git a/Gemfile b/Gemfile
index 082a069..6661d4e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ ruby '2.4.1'
 
 gem 'rails', '~> 5.2.3'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'jbuilder', '~> 2.5'
 gem 'bootsnap', '>= 1.1.0', require: false
 gem 'rack-cors', require: 'rack/cors'
diff --git a/Gemfile.lock b/Gemfile.lock
index edbefab..de26e0c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -120,7 +120,9 @@ 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 (1.0.1)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
@@ -138,7 +140,8 @@ GEM
       pry (~> 0.10)
     pry-rails (0.3.9)
       pry (>= 0.10.4)
-    puma (3.12.1)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-cors (1.0.3)
     rack-test (1.1.0)
@@ -240,7 +243,7 @@ DEPENDENCIES
   pg (>= 0.18, < 2.0)
   pry-byebug
   pry-rails
-  puma (~> 3.11)
+  puma (~> 4.3)
   rack-cors
   rails (~> 5.2.3)
   rspec-rails