diff --git a/Gemfile b/Gemfile
index 235d6bc..bda9a4c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem 'sqlite3', groups: %w(test development), require: false
 
 gem 'pg', groups: %w(production), require: false
 # 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 26dbad0..583d373 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -304,7 +304,8 @@ GEM
       json (>= 1, < 3)
     pg (1.1.4)
     public_suffix (4.0.1)
-    puma (3.12.3)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.0.8)
     rack-cors (1.1.0)
       rack (>= 2.0.0)
@@ -421,7 +422,7 @@ DEPENDENCIES
   fog
   listen (>= 3.0.5, < 3.2)
   pg
-  puma (~> 3.12)
+  puma (~> 4.3)
   rack-cors
   rails (~> 5.2.3)
   rspec-rails (~> 3.6)