diff --git a/Gemfile b/Gemfile
index 5fe2a8e..5c13217 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,7 +12,7 @@ gem "ransack", github: "activerecord-hackery/ransack", ref: "aada8"
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.12'
+gem 'puma', '~> 4.3'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 # gem 'jbuilder', '~> 2.7'
 # Use Active Model has_secure_password
diff --git a/Gemfile.lock b/Gemfile.lock
index 54a0781..37f605c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -149,7 +149,8 @@ GEM
     nokogiri (1.10.8)
       mini_portile2 (~> 2.4.0)
     pg (1.1.4)
-    puma (3.12.6)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -231,7 +232,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   nokogiri
   pg (>= 0.18, < 2.0)
-  puma (~> 3.12)
+  puma (~> 4.3)
   rails (~> 6.0.0.rc2)
   ransack!
   spring