diff --git a/Start Ruby on Rails from scratch/Gemfile b/Start Ruby on Rails from scratch/Gemfile
index cbbf119..6e5b73f 100644
--- a/Start Ruby on Rails from scratch/Gemfile	
+++ b/Start Ruby on Rails from scratch/Gemfile	
@@ -8,7 +8,7 @@ gem 'rails', '~> 6.0.0'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3', '~> 1.4'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5'
 # Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker
diff --git a/Start Ruby on Rails from scratch/Gemfile.lock b/Start Ruby on Rails from scratch/Gemfile.lock
index dce9468..2217204 100644
--- a/Start Ruby on Rails from scratch/Gemfile.lock	
+++ b/Start Ruby on Rails from scratch/Gemfile.lock	
@@ -91,7 +91,8 @@ GEM
     nio4r (2.5.2)
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
-    puma (3.12.1)
+    puma (4.3.11)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-proxy (0.6.5)
       rack
@@ -181,7 +182,7 @@ DEPENDENCIES
   byebug
   jbuilder (~> 2.7)
   listen (>= 3.0.5, < 3.2)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 6.0.0)
   sass-rails (~> 5)
   spring