diff --git a/Gemfile b/Gemfile
index a331cad..c210889 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ ruby '2.6.2'
 
 gem 'rails', '5.2.3'
 gem 'pg', '1.1.4'
-gem 'puma', '3.12.2'
+gem 'puma', '4.3.8'
 
 gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 38f286c..2c397df 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -84,7 +84,9 @@ 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)
@@ -92,7 +94,8 @@ GEM
     nokogiri (1.10.5)
       mini_portile2 (~> 2.4.0)
     pg (1.1.4)
-    puma (3.12.2)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     rack (2.0.6)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -191,7 +194,7 @@ DEPENDENCIES
   factory_bot_rails (= 5.0.1)
   listen (>= 3.0.5, < 3.2)
   pg (= 1.1.4)
-  puma (= 3.12.2)
+  puma (= 4.3.8)
   rails (= 5.2.3)
   rspec-rails (= 3.8.2)
   sass-rails (~> 5.0)