diff --git a/aula_models/Dojo_MVC/Gemfile b/aula_models/Dojo_MVC/Gemfile
index 3f6471f..ce3c971 100644
--- a/aula_models/Dojo_MVC/Gemfile
+++ b/aula_models/Dojo_MVC/Gemfile
@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.3'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/aula_models/Dojo_MVC/Gemfile.lock b/aula_models/Dojo_MVC/Gemfile.lock
index a69d7df..ef7bf7c 100644
--- a/aula_models/Dojo_MVC/Gemfile.lock
+++ b/aula_models/Dojo_MVC/Gemfile.lock
@@ -166,7 +166,8 @@ GEM
       mini_portile2 (~> 2.4.0)
     popper_js (1.14.5)
     public_suffix (3.0.3)
-    puma (3.12.1)
+    puma (4.3.9)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -271,7 +272,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   jquery-rails
   listen (>= 3.0.5, < 3.2)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 5.2.3)
   rspec-core!
   rspec-expectations!