diff --git a/.github/workflows/build_test.yml b/.github/workflows/build_test.yml
index 19a20764d5..7ed367cc90 100644
--- a/.github/workflows/build_test.yml
+++ b/.github/workflows/build_test.yml
@@ -65,6 +65,7 @@ jobs:
           - "7.0"
           - "7.1"
           - "7.2"
+          - "main"
         ruby:
           - "3.1"
           - "3.2"
diff --git a/Gemfile b/Gemfile
index 319a24ff7f..8ca94cc0b9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,11 +4,15 @@ source "https://rubygems.org"
 
 gemspec
 
-rails_version = ENV.fetch("RAILS_VERSION", "7.2")
-gem "rails", "~> #{rails_version}.0"
+rails_version = ENV.fetch("RAILS_VERSION", "main")
+if rails_version == "main"
+  gem "rails", github: "rails/rails", branch: "main"
+else
+  gem "rails", "~> #{rails_version}.0"
+end
 
 if ENV["DB"].nil? || ENV["DB"] == "sqlite"
-  gem "sqlite3", "~> 1.7.0"
+  gem "sqlite3", "~> 2.0.0"
 end
 if ENV["DB"] == "mysql" || ENV["DB"] == "mariadb"
   gem "mysql2", "~> 0.5.1"
diff --git a/alchemy_cms.gemspec b/alchemy_cms.gemspec
index a64c14fa08..ce360e9f53 100644
--- a/alchemy_cms.gemspec
+++ b/alchemy_cms.gemspec
@@ -29,7 +29,7 @@ Gem::Specification.new do |gem|
     activesupport
     railties
   ].each do |rails_gem|
-    gem.add_runtime_dependency rails_gem, [">= 7.0", "< 7.3"]
+    gem.add_runtime_dependency rails_gem, [">= 7.0", "< 8.1"]
   end
 
   gem.add_runtime_dependency "active_model_serializers", ["~> 0.10.14"]
@@ -42,14 +42,14 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency "dragonfly_svg", ["~> 0.0.4"]
   gem.add_runtime_dependency "gutentag", ["~> 2.2", ">= 2.2.1"]
   gem.add_runtime_dependency "handlebars_assets", ["~> 0.23"]
-  gem.add_runtime_dependency "importmap-rails", ["~> 1.2", ">= 1.2.1"]
+  gem.add_runtime_dependency "importmap-rails", ["~> 2.0"]
   gem.add_runtime_dependency "jquery-rails", ["~> 4.0", ">= 4.0.4"]
   gem.add_runtime_dependency "kaminari", ["~> 1.1"]
   gem.add_runtime_dependency "originator", ["~> 3.1"]
-  gem.add_runtime_dependency "ransack", [">= 1.8", "< 5.0"]
+  gem.add_runtime_dependency "ransack", ["~> 4.2", "< 5.0"]
   gem.add_runtime_dependency "simple_form", [">= 4.0", "< 6"]
   gem.add_runtime_dependency "sprockets-rails", [">= 3.5", "< 4"]
-  gem.add_runtime_dependency "turbo-rails", [">= 1.4", "< 2.1"]
+  gem.add_runtime_dependency "turbo-rails", ["~> 2.0", "< 2.1"]
   gem.add_runtime_dependency "view_component", ["~> 3.0"]
 
   gem.add_development_dependency "capybara", ["~> 3.0"]
@@ -59,7 +59,7 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency "puma", ["~> 6.0"]
   gem.add_development_dependency "rails-controller-testing", ["~> 1.0"]
   gem.add_development_dependency "rspec-activemodel-mocks", ["~> 1.0"]
-  gem.add_development_dependency "rspec-rails", ["~> 6.1"]
+  gem.add_development_dependency "rspec-rails", ["~> 7.0"]
   gem.add_development_dependency "simplecov", ["~> 0.20"]
   gem.add_development_dependency "selenium-webdriver", ["~> 4.10"]
   gem.add_development_dependency "webmock", ["~> 3.3"]
diff --git a/lib/generators/alchemy/install/install_generator.rb b/lib/generators/alchemy/install/install_generator.rb
index 22187ef29d..b09fbe8690 100644
--- a/lib/generators/alchemy/install/install_generator.rb
+++ b/lib/generators/alchemy/install/install_generator.rb
@@ -66,7 +66,11 @@ def copy_yml_files
       def install_assets
         copy_file "all.js", app_vendor_assets_path.join("javascripts", "alchemy", "admin", "all.js")
         copy_file "custom.css", app_assets_path.join("stylesheets/alchemy/admin/custom.css")
-        append_to_file Rails.root.join("app/assets/config/manifest.js"), "//= link alchemy/admin/custom.css\n"
+        if File.exist?(Rails.root.join("app/assets/config/manifest.js"))
+          append_to_file Rails.root.join("app/assets/config/manifest.js"), "//= link alchemy/admin/custom.css\n"
+        else
+          create_file Rails.root.join("app/assets/config/manifest.js"), "//= link alchemy/admin/custom.css\n"
+        end
       end
 
       def copy_demo_views
diff --git a/spec/dummy/config/application.rb b/spec/dummy/config/application.rb
index 38ce4a431c..85a3c89717 100644
--- a/spec/dummy/config/application.rb
+++ b/spec/dummy/config/application.rb
@@ -23,7 +23,7 @@ module Dummy
   class Application < Rails::Application
     # Initialize configuration defaults for originally generated Rails version.
     if config.respond_to?(:load_defaults)
-      config.load_defaults ENV["RAILS_VERSION"] || 7.2
+      config.load_defaults ENV["RAILS_VERSION"] == "main" ? 8.0 : ENV.fetch("RAILS_VERSION", 8.0)
     end
 
     # Settings in config/environments/* take precedence over those specified here.
diff --git a/spec/dummy/db/schema.rb b/spec/dummy/db/schema.rb
index 676ff4a484..e76e531dbf 100644
--- a/spec/dummy/db/schema.rb
+++ b/spec/dummy/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.2].define(version: 2024_04_11_155901) do
+ActiveRecord::Schema[8.0].define(version: 2024_04_11_155901) do
   create_table "alchemy_attachments", force: :cascade do |t|
     t.string "name"
     t.string "file_name"