diowa · tagliala · Dec 25, 2025 · Dec 25, 2025
diff --git a/.rubocop.yml b/.rubocop.yml
@@ -8,7 +8,7 @@ plugins:
 
 AllCops:
   TargetRailsVersion: 8.1
-  TargetRubyVersion: 3.4
+  TargetRubyVersion: 4.0
   NewCops: enable
   DisplayStyleGuide: true
   ExtraDetails: true

diff --git a/.ruby-version b/.ruby-version
@@ -1 +1 @@
-ruby-3.4.8
+ruby-4.0.0
diff --git a/Dockerfile b/Dockerfile
@@ -8,7 +8,7 @@
 # For a containerized dev environment, see Dev Containers: https://guides.rubyonrails.org/getting_started_with_devcontainer.html
 
 # Make sure RUBY_VERSION matches the Ruby version in .ruby-version
-ARG RUBY_VERSION=3.4.8
+ARG RUBY_VERSION=4.0.0
 FROM docker.io/library/ruby:$RUBY_VERSION-slim AS base
 
 # Rails app lives here

diff --git a/Gemfile b/Gemfile
@@ -33,6 +33,7 @@ group :development, :test do
   gem 'pry'
   gem 'pry-byebug'
   gem 'pry-rails'
+  gem 'readline' # TODO: Remove when deivid-rodriguez/pry-byebug#460 will be fixed
   gem 'rspec-rails'
   gem 'rubocop', require: false
   gem 'rubocop-capybara', require: false

diff --git a/Gemfile.lock b/Gemfile.lock
@@ -318,6 +318,8 @@ GEM
       erb
       psych (>= 4.0.0)
       tsort
+    readline (0.0.4)
+      reline
     regexp_parser (2.11.3)
     reline (0.6.3)
       io-console (~> 0.5)
@@ -494,6 +496,7 @@ DEPENDENCIES
   puma
   rack-mini-profiler
   rails (= 8.1.1)
+  readline
   rspec-rails
   rubocop
   rubocop-capybara

diff --git a/README.md b/README.md
@@ -7,7 +7,7 @@
 
 This is an opinionated starter web application based on the following technology stack:
 
-* [Ruby 3.4.8][:ruby-url]
+* [Ruby 4.0.0][:ruby-url]
 * [Rails 8.1.1][:ruby-on-rails-url]
 * [Tailwind CSS 4.1.18][:tailwind-css-url]
 * [Flowbite 3.1.2][:flowbite-url]

diff --git a/app/views/pages/home.html.erb b/app/views/pages/home.html.erb
@@ -9,7 +9,7 @@
 <ul class="text-xl flex flex-wrap space-x-2">
   <li>
     Ruby
-    <small class="text-gray-600 dark:text-gray-300">3.4.8</small>
+    <small class="text-gray-600 dark:text-gray-300">4.0.0</small>
   </li>
   <li>
     Rails

diff --git a/config/deploy.yml b/config/deploy.yml
@@ -82,7 +82,7 @@ builder:
   #
   # # Pass arguments and secrets to the Docker build process
   # args:
-  #   RUBY_VERSION: ruby-3.4.8
+  #   RUBY_VERSION: ruby-4.0.0
   # secrets:
   #   - GITHUB_TOKEN
   #   - RAILS_MASTER_KEY

diff --git a/config/locales/en.yml b/config/locales/en.yml
@@ -1,7 +1,7 @@
 ---
 en:
   app_name: Rails 8 Starter App
-  meta_description: An opinionated starter application based on Ruby 3.4, Rails 8.1, Tailwind CSS, and Flowbite
+  meta_description: An opinionated starter application based on Ruby 4.0, Rails 8.1, Tailwind CSS, and Flowbite
   pages:
     hello_world:
       title: Hello World
-Original file line number
+Diff line change
@@ Expand Up / @@ -9,7 +9,7 @@ @@
     <ul class="text-xl flex flex-wrap space-x-2">
       <li>
         Ruby
-        <small class="text-gray-600 dark:text-gray-300">3.4.8</small>
+        <small class="text-gray-600 dark:text-gray-300">4.0.0</small>
       </li>
       <li>
         Rails
@@ Expand Down @@