diff --git a/Gemfile b/Gemfile
index 319a24ff7f..2e11116588 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,11 +4,11 @@ source "https://rubygems.org"
 
 gemspec
 
-rails_version = ENV.fetch("RAILS_VERSION", "7.2")
-gem "rails", "~> #{rails_version}.0"
+rails_version = ENV.fetch("RAILS_VERSION", "8.0")
+gem "rails", github: "rails/rails", branch: "main"
 
 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..0394c055cc 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"]
@@ -42,7 +42,7 @@ 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"]
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