diff --git a/Gemfile b/Gemfile
index fb3a475..17e143f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ ruby '2.5.1'
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 6.0.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 # gem 'jbuilder', '~> 2.7'
 # Use Redis adapter to run Action Cable in production
diff --git a/Gemfile.lock b/Gemfile.lock
index 471ba39..a5ac5ca 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -158,7 +158,9 @@ 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 (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.12.2)
@@ -177,7 +179,8 @@ GEM
     pg (1.1.4-x64-mingw32)
     polyamorous (2.3.2)
       activerecord (>= 5.2.1)
-    puma (3.12.1)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-cors (1.0.5)
       rack (>= 1.6.0)
@@ -305,7 +308,7 @@ DEPENDENCIES
   factory_bot_rails
   listen (>= 3.0.5, < 3.2)
   pg (~> 1.1)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rack-cors
   rails (~> 6.0.0)
   rspec-rails (~> 3.5)