diff --git a/Gemfile b/Gemfile
index 9344bef..1a884a8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 ruby '2.6.3'
 
 gem 'bootsnap', '>= 1.1.0', require: false
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'rails', '~> 5.2.3'
 
 # DB
diff --git a/Gemfile.lock b/Gemfile.lock
index 2184e23..2c75ab1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -142,7 +142,9 @@ 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)
@@ -163,7 +165,8 @@ GEM
     pry-byebug (3.7.0)
       byebug (~> 11.0)
       pry (~> 0.10)
-    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)
@@ -332,7 +335,7 @@ DEPENDENCIES
   overcommit (~> 0.49.1)
   pg (>= 0.18, < 2.0)
   pry-byebug (~> 3.7)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rack-cors (~> 1.0, >= 1.0.3)
   rails (~> 5.2.3)
   rails_best_practices (~> 1.19)