diff --git a/Gemfile b/Gemfile
index 98cad6d..f4e24e4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -15,7 +15,7 @@ gem 'mysql2'
 gem 'dotenv-rails'
 
 # 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', '~> 2.5'
 # Use Redis adapter to run Action Cable in production
diff --git a/Gemfile.lock b/Gemfile.lock
index a16f593..d8f6303 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -83,7 +83,8 @@ GEM
       method_source (~> 0.9.0)
     pry-rails (0.3.7)
       pry (>= 0.10.4)
-    puma (3.12.6)
+    puma (4.3.9)
+      nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)
     rack-cors (1.0.5)
@@ -150,7 +151,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   mysql2
   pry-rails
-  puma (~> 3.12)
+  puma (~> 4.3)
   rack-cors
   rails (~> 5.1.6)
   spring