diff --git a/Gemfile b/Gemfile
index 70c52a9..e8868c9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ gem 'nokogiri', '~> 1.11'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.12.6'
+gem 'puma', '~> 4.3.12'
 
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 # gem 'jbuilder', '~> 2.5'
diff --git a/Gemfile.lock b/Gemfile.lock
index 4730868..c38b39b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -139,7 +139,9 @@ 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
     mina (1.2.3)
       open4 (~> 1.3.4)
       rake
@@ -172,7 +174,8 @@ GEM
     pry-rails (0.3.6)
       pry (>= 0.10.4)
     public_suffix (3.0.3)
-    puma (3.12.6)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)
     rack-cors (1.0.5)
@@ -323,7 +326,7 @@ DEPENDENCIES
   pg (>= 0.18, < 2.0)
   pry (= 0.11.3)
   pry-rails
-  puma (~> 3.12.6)
+  puma (~> 4.3.12)
   rack-cors
   rails (>= 5.2.2.1)
   ransack (~> 2.0, >= 2.0.1)