diff --git a/Gemfile b/Gemfile
index fb89354..0fa3043 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ ruby '2.6.3'
 
 gem 'rails', '~> 5.2.4', '>= 5.2.4.2'
 gem 'pg'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'rswag'
 
 gem 'bootsnap', '>= 1.1.0', require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index 1d8e0db..22e3f27 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -81,7 +81,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (1.0.0)
-    mimemagic (0.3.4)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.14.0)
@@ -91,7 +93,8 @@ GEM
       mini_portile2 (~> 2.4.0)
     pg (1.2.3)
     public_suffix (4.0.4)
-    puma (3.12.4)
+    puma (4.3.8)
+      nio4r (~> 2.0)
     rack (2.2.2)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -183,7 +186,7 @@ DEPENDENCIES
   factory_bot_rails
   listen (>= 3.0.5, < 3.2)
   pg
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 5.2.4, >= 5.2.4.2)
   rspec-rails (~> 4.0.0)
   rswag