diff --git a/Gemfile.lock b/Gemfile.lock
index 28ff220..2644eb6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    cssbundling-rails (1.1.2)
+    cssbundling-rails (1.2.0)
       railties (>= 6.0.0)
 
 GEM
@@ -96,14 +96,14 @@ GEM
     mini_mime (1.0.3)
     minitest (5.14.4)
     nio4r (2.5.7)
-    nokogiri (1.13.6-arm64-darwin)
+    nokogiri (1.15.2-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.13.6-x86_64-darwin)
+    nokogiri (1.15.2-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.13.6-x86_64-linux)
+    nokogiri (1.15.2-x86_64-linux)
       racc (~> 1.4)
     public_suffix (4.0.6)
-    racc (1.5.2)
+    racc (1.7.1)
     rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
diff --git a/README.md b/README.md
index ff12ef5..ee8e906 100644
--- a/README.md
+++ b/README.md
@@ -8,9 +8,7 @@ Whenever the bundler detects changes to any of the stylesheet files in your proj
 
 When you deploy your application to production, the `css:build` task attaches to the `assets:precompile` task to ensure that all your package dependencies from `package.json` have been installed via yarn, and then runs `yarn build:css` to process your stylesheet entrypoint, as it would in development. This output is then picked up by the asset pipeline, digested, and copied into public/assets, as any other asset pipeline file.
 
-This also happens in testing where the bundler attaches to the `test:prepare` task to ensure the stylesheets have been bundled before testing commences. (Note that this currently only applies to rails `test:*` tasks (like `test:all` or `test:controllers`), not "rails test", as that doesn't load `test:prepare`).
-
-If your test framework does not define a `test:prepare` Rake task, ensure that your test framework runs `css:build` to bundle stylesheets before testing commences. If your setup uses [jsbundling-rails](https://github.com/rails/jsbundling-rails) (ie, esbuild + tailwind), you will also need to run `javascript:build`.
+This also happens in testing where the bundler attaches to the `test:prepare` task to ensure the stylesheets have been bundled before testing commences. If your test framework does not call the `test:prepare` Rake task, ensure that your test framework runs `css:build` to bundle stylesheets before testing commences. If your setup uses [jsbundling-rails](https://github.com/rails/jsbundling-rails) (ie, esbuild + tailwind), you will also need to run `javascript:build`.
 
 That's it!
 
@@ -45,6 +43,14 @@ Some CSS packages use new CSS features that are not supported by the default Sas
 
 A common issue is that your repository does not contain the output directory used by the build commands. You must have `app/assets/builds` available. Add the directory with a `.gitkeep` file, and you'll ensure it's available in production.
 
+### Why isn't Rails using my updated css files?
+
+Watch out - if you precompile your files locally, those will be served over the dynamically created ones you expect. The solution:
+
+```shell
+rails assets:clobber 
+```
+
 ## License
 
 CSS Bundling for Rails is released under the [MIT License](https://opensource.org/licenses/MIT).
diff --git a/lib/cssbundling/version.rb b/lib/cssbundling/version.rb
index 6b4798e..36f63c4 100644
--- a/lib/cssbundling/version.rb
+++ b/lib/cssbundling/version.rb
@@ -1,3 +1,3 @@
 module Cssbundling
-  VERSION = "1.1.2"
+  VERSION = "1.2.0"
 end
diff --git a/lib/install/Procfile.dev b/lib/install/Procfile.dev
index cb7c9aa..0fc822f 100644
--- a/lib/install/Procfile.dev
+++ b/lib/install/Procfile.dev
@@ -1,2 +1,2 @@
-web: unset PORT && bin/rails server
+web: unset PORT && env RUBY_DEBUG_OPEN=true bin/rails server
 css: yarn build:css --watch
diff --git a/lib/install/bootstrap/install.rb b/lib/install/bootstrap/install.rb
index ec1a67f..ac920f6 100644
--- a/lib/install/bootstrap/install.rb
+++ b/lib/install/bootstrap/install.rb
@@ -1,7 +1,7 @@
-say "Install Bootstrap with Bootstrap Icons and Popperjs/core"
+say "Install Bootstrap with Bootstrap Icons, Popperjs/core and Autoprefixer"
 copy_file "#{__dir__}/application.bootstrap.scss",
    "app/assets/stylesheets/application.bootstrap.scss"
-run "yarn add sass bootstrap bootstrap-icons @popperjs/core"
+run "yarn add sass bootstrap bootstrap-icons @popperjs/core postcss postcss-cli autoprefixer nodemon"
 
 inject_into_file "config/initializers/assets.rb", after: /.*Rails.application.config.assets.paths.*\n/ do
   <<~RUBY
@@ -16,16 +16,32 @@
   say %(Add import * as bootstrap from "bootstrap" to your entry point JavaScript file), :red
 end
 
-say "Add build:css script"
-build_script = "sass ./app/assets/stylesheets/application.bootstrap.scss:./app/assets/builds/application.css --no-source-map --load-path=node_modules"
+def add_npm_script(name, script, run_script=true)
+  case `npx -v`.to_f
+  when 7.1...8.0
+    say "Add #{name} script"
+    run %(npm set-script #{name} "#{script}")
+    run %(yarn #{name}) if run_script
+  when (8.0..)
+    say "Add #{name} script"
+    run %(npm pkg set scripts.#{name}="#{script}")
+    run %(yarn #{name}) if run_script
+  else
+    say %(Add "scripts": { "#{name}": "#{script}" } to your package.json), :green
+  end
+end
+
+add_npm_script("build:css:compile", "sass ./app/assets/stylesheets/application.bootstrap.scss:./app/assets/builds/application.css --no-source-map --load-path=node_modules")
+add_npm_script("build:css:prefix", "postcss ./app/assets/builds/application.css --use=autoprefixer --output=./app/assets/builds/application.css")
+add_npm_script("build:css", "yarn build:css:compile && yarn build:css:prefix")
+add_npm_script("watch:css", "nodemon --watch ./app/assets/stylesheets/ --ext scss --exec \\\"yarn build:css\\\"", false)
+
+gsub_file "Procfile.dev", "build:css --watch", "watch:css"
 
 case `npx -v`.to_f
-when 7.1...8.0
-  run %(npm set-script build:css "#{build_script}")
-  run %(yarn build:css)
-when (8.0..)
-  run %(npm pkg set scripts.build:css="#{build_script}")
-  run %(yarn build:css)
+when (7.1..)
+  say "Add browserslist config"
+  run %(npm pkg set browserslist[]=defaults)
 else
-  say %(Add "scripts": { "build:css": "#{build_script}" } to your package.json), :green
+  say %(Add "browserslist": ["defaults"] to your package.json), :green
 end
diff --git a/lib/tasks/cssbundling/build.rake b/lib/tasks/cssbundling/build.rake
index 1e3a9b0..2c6a5ed 100644
--- a/lib/tasks/cssbundling/build.rake
+++ b/lib/tasks/cssbundling/build.rake
@@ -2,17 +2,21 @@ namespace :css do
   desc "Build your CSS bundle"
   task :build do
     unless system "yarn install && yarn build:css"
-      raise "cssbundling-rails: Command css:build failed, ensure yarn is installed and `yarn build:css` runs without errors"
+      raise "cssbundling-rails: Command css:build failed, ensure yarn is installed and `yarn build:css` runs without errors or use SKIP_CSS_BUILD env variable"
     end
   end
 end
 
-if Rake::Task.task_defined?("assets:precompile")
-  Rake::Task["assets:precompile"].enhance(["css:build"])
-end
+unless ENV["SKIP_CSS_BUILD"]
+  if Rake::Task.task_defined?("assets:precompile")
+    Rake::Task["assets:precompile"].enhance(["css:build"])
+  end
 
-if Rake::Task.task_defined?("test:prepare")
-  Rake::Task["test:prepare"].enhance(["css:build"])
-elsif Rake::Task.task_defined?("db:test:prepare")
-  Rake::Task["db:test:prepare"].enhance(["css:build"])
+  if Rake::Task.task_defined?("test:prepare")
+    Rake::Task["test:prepare"].enhance(["css:build"])
+  elsif Rake::Task.task_defined?("spec:prepare")
+    Rake::Task["spec:prepare"].enhance(["css:build"])
+  elsif Rake::Task.task_defined?("db:test:prepare")
+    Rake::Task["db:test:prepare"].enhance(["css:build"])
+  end
 end
diff --git a/lib/tasks/cssbundling/clobber.rake b/lib/tasks/cssbundling/clobber.rake
index 9bfcae9..14b0215 100644
--- a/lib/tasks/cssbundling/clobber.rake
+++ b/lib/tasks/cssbundling/clobber.rake
@@ -1,7 +1,7 @@
 namespace :css do
   desc "Remove CSS builds"
   task :clobber do
-    rm_rf Dir["app/assets/builds/**/[^.]*.css"], verbose: false
+    rm_rf Dir["app/assets/builds/**/[^.]*.{css,css.map}"], verbose: false
   end
 end