diff --git a/Gemfile b/Gemfile
index 1a5385a..2c76b2c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ ruby '2.6.0'
 
 gem 'rails', '~> 6.0.0.rc1'
 gem 'sqlite3'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'bootsnap', '>= 1.1.0', require: false
 gem 'responders'
 gem 'faker'
diff --git a/Gemfile.lock b/Gemfile.lock
index ed93694..d972286 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -94,7 +94,9 @@ 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 (5.11.3)
@@ -110,7 +112,8 @@ 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-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -205,7 +208,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   pry-byebug
   pry-rails
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 6.0.0.rc1)
   responders
   rspec-rails (~> 3.8)