diff --git a/Gemfile b/Gemfile
index 16a6406..ed6ccdb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ gem 'aws-sdk-s3', '~> 1.64.0'
 gem 'bootsnap', '>= 1.4.2', require: false
 gem 'jbuilder', '~> 2.7'
 gem 'mysql2', '>= 0.5.2'
-gem 'puma', '~> 3.12'
+gem 'puma', '~> 4.3'
 gem 'rack-cors', '~> 1.1.0'
 gem 'rails', '~> 6.0.0'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 10cc214..0e9a6e7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -100,7 +100,9 @@ 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)
@@ -112,7 +114,8 @@ GEM
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    puma (3.12.6)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.2.3)
     rack-cors (1.1.0)
       rack (>= 2.0.0)
@@ -180,7 +183,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   mysql2 (>= 0.5.2)
   pry (~> 0.12.2)
-  puma (~> 3.12)
+  puma (~> 4.3)
   rack-cors (~> 1.1.0)
   rails (~> 6.0.0)
   spring