diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..03ae872
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,130 @@
+name: ci
+concurrency:
+  group: "${{github.workflow}}-${{github.ref}}"
+  cancel-in-progress: true
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+    tags:
+      - v*.*.*
+  pull_request:
+    types: [opened, synchronize]
+    branches:
+      - '*'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: ["3.0", "3.1", "3.2", "3.3", "3.4", "head"]
+    steps:
+      - uses: actions/checkout@v4
+      - run: rm Gemfile.lock
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{matrix.ruby}}
+          bundler: latest
+          bundler-cache: true
+      - name: Run tests
+        run: bundle exec rake test
+
+  package:
+    needs: [ "test" ]
+    name: "package (${{ matrix.platform }})"
+    strategy:
+      fail-fast: false
+      matrix:
+        platform:
+          - "ruby"
+          - "aarch64-linux-gnu"
+          - "aarch64-linux-musl"
+          - "arm64-darwin"
+          - "x64-mingw-ucrt"
+          - "x64-mingw32"
+          - "x86_64-darwin"
+          - "x86_64-linux-gnu"
+          - "x86_64-linux-musl"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: rm Gemfile.lock
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.2"
+          bundler: latest
+          bundler-cache: true
+      - run: "bundle exec rake gem:${{matrix.platform}}"
+      - uses: actions/upload-artifact@v4
+        with:
+          name: gem-${{matrix.platform}}
+          path: pkg
+          retention-days: 1
+
+  install-ruby:
+    name: "install (ruby)"
+    needs: [ "package" ]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.2"
+      - uses: actions/download-artifact@v4
+        with:
+          name: gem-ruby
+          path: pkg
+      - run: "gem install pkg/tailwindcss-ruby-*.gem"
+      - run: "tailwindcss 2>&1 | fgrep 'ERROR: Cannot find the tailwindcss executable'"
+
+  install-native:
+    name: "install (${{ matrix.platform }})"
+    needs: [ "package" ]
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: [ "3.4" ]
+        platform:
+          - "aarch64-linux-gnu"
+          - "aarch64-linux-musl"
+          - "arm64-darwin"
+          - "x64-mingw-ucrt"
+          # - "x64-mingw32" # because it's on a different version of ruby, we just add it in an "include" below
+          - "x86_64-darwin"
+          - "x86_64-linux-gnu"
+          - "x86_64-linux-musl"
+        include:
+          - { platform: aarch64-linux-gnu, docker_platform: "--platform=linux/arm64/v8" }
+          - { platform: aarch64-linux-musl, docker_tag: "-alpine", docker_platform: "--platform=linux/arm64/v8", bootstrap: "apk add build-base &&" }
+          - { platform: arm64-darwin, runs_on: macos-14 }
+          - { platform: x64-mingw-ucrt, runs_on: windows-latest }
+          - { platform: x64-mingw32, runs_on: windows-latest, ruby: "3.0" }
+          - { platform: x86_64-darwin, runs_on: macos-13 }
+          - { platform: x86_64-linux-musl, docker_tag: "-alpine", bootstrap: "apk add build-base &&" }
+    runs-on: ${{ matrix.runs_on || 'ubuntu-latest' }}
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: gem-${{ matrix.platform }}
+          path: pkg
+      - if: ${{ matrix.runs_on }}
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+      - if: ${{ matrix.runs_on }}
+        run: "gem install pkg/tailwindcss-ruby-*.gem"
+      - if: ${{ matrix.runs_on }}
+        run: "tailwindcss --help"
+      - if: ${{ (! matrix.runs_on) && matrix.docker_platform }}
+        run: docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+      - if: ${{ ! matrix.runs_on }}
+        run: |
+          docker run --rm -v $PWD:/tailwindcss-ruby -w /tailwindcss-ruby \
+            ${{ matrix.docker_platform }} ruby:${{ matrix.ruby }}${{ matrix.docker_tag }} \
+            sh -c "
+              ${{ matrix.bootstrap }}
+              gem install pkg/tailwindcss-ruby-*.gem
+              tailwindcss --help
+            "
diff --git a/.github/workflows/downstream.yml b/.github/workflows/downstream.yml
index 853598e..573bf98 100644
--- a/.github/workflows/downstream.yml
+++ b/.github/workflows/downstream.yml
@@ -9,7 +9,6 @@ on:
   push:
     branches:
       - main
-      - v4.x
     tags:
       - v*.*.*
   pull_request:
@@ -27,15 +26,15 @@ jobs:
           - url: https://github.com/rails/tailwindcss-rails
             name: rails-unit
             command: "bin/test"
-            ruby: "3.3"
+            ruby: "3.4"
           - url: https://github.com/rails/tailwindcss-rails
             name: rails-install
             command: "env TAILWINDCSSOPTS=--path=../../.. test/integration/user_install_test.sh"
-            ruby: "3.3"
+            ruby: "3.4"
           - url: https://github.com/rails/tailwindcss-rails
             name: rails-upgrade
             command: "env TAILWINDCSSOPTS=--path=../../.. test/integration/user_upgrade_test.sh"
-            ruby: "3.3"
+            ruby: "3.4"
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/gem-install.yml b/.github/workflows/gem-install.yml
deleted file mode 100644
index 981194c..0000000
--- a/.github/workflows/gem-install.yml
+++ /dev/null
@@ -1,186 +0,0 @@
-name: packaging
-concurrency:
-  group: "${{github.workflow}}-${{github.ref}}"
-  cancel-in-progress: true
-on:
-  workflow_dispatch:
-  push:
-    branches:
-      - main
-      - v4.x
-    tags:
-      - v*.*.*
-  pull_request:
-    types: [opened, synchronize]
-    branches:
-      - '*'
-
-jobs:
-  package:
-    strategy:
-      fail-fast: false
-      matrix:
-        platform:
-          - "ruby"
-          - "x64-mingw32"
-          - "x64-mingw-ucrt"
-          - "x86_64-darwin"
-          - "arm64-darwin"
-          - "x86_64-linux-gnu"
-          - "x86_64-linux-musl"
-          - "aarch64-linux-gnu"
-          - "aarch64-linux-musl"
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - run: rm Gemfile.lock
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: "3.2"
-          bundler: latest
-          bundler-cache: true
-      - run: "bundle exec rake gem:${{matrix.platform}}"
-      - uses: actions/upload-artifact@v4
-        with:
-          name: gem-${{matrix.platform}}
-          path: pkg
-          retention-days: 1
-
-  vanilla-install:
-    needs: ["package"]
-    runs-on: ubuntu-latest
-    steps:
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: "3.2"
-      - uses: actions/download-artifact@v4
-        with:
-          name: gem-ruby
-          path: pkg
-      - run: "gem install pkg/tailwindcss-ruby-*.gem"
-      - run: "tailwindcss 2>&1 | fgrep 'ERROR: Cannot find the tailwindcss executable'"
-
-  linux-x86_64-gnu-install:
-    needs: ["package"]
-    runs-on: ubuntu-latest
-    steps:
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: "3.2"
-      - uses: actions/download-artifact@v4
-        with:
-          name: gem-x86_64-linux-gnu
-          path: pkg
-      - run: "gem install pkg/tailwindcss-ruby-*.gem"
-      - run: "tailwindcss --help"
-
-  linux-x86_64-musl-install:
-    needs: ["package"]
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/download-artifact@v4
-        with:
-          name: gem-x86_64-linux-musl
-          path: pkg
-      - run: |
-          docker run --rm -v $PWD:/tailwindcss-ruby -w /tailwindcss-ruby \
-            ruby:3.2-alpine \
-            sh -c "
-              apk add build-base
-              gem install pkg/tailwindcss-ruby-*.gem
-              tailwindcss --help
-            "
-
-  linux-aarch64-gnu-install:
-    needs: ["package"]
-    runs-on: ubuntu-latest
-    steps:
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: "3.2"
-      - uses: actions/download-artifact@v4
-        with:
-          name: gem-aarch64-linux-gnu
-          path: pkg
-      - run: |
-          docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
-          docker run --rm -v $PWD:/tailwindcss-ruby -w /tailwindcss-ruby \
-            --platform=linux/arm64/v8 ruby:3.2 \
-            sh -c "
-              gem install pkg/tailwindcss-ruby-*.gem
-              tailwindcss --help
-            "
-
-  linux-aarch64-musl-install:
-    needs: ["package"]
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/download-artifact@v4
-        with:
-          name: gem-aarch64-linux-musl
-          path: pkg
-      - run: |
-          docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
-          docker run --rm -v $PWD:/tailwindcss-ruby -w /tailwindcss-ruby \
-            --platform=linux/arm64/v8 ruby:3.2-alpine \
-            sh -c "
-              apk add build-base
-              gem install pkg/tailwindcss-ruby-*.gem
-              tailwindcss --help
-            "
-
-  darwin-x86_64-install:
-    needs: ["package"]
-    runs-on: macos-13
-    steps:
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: "3.2"
-      - uses: actions/download-artifact@v4
-        with:
-          name: gem-x86_64-darwin
-          path: pkg
-      - run: "gem install pkg/tailwindcss-ruby-*.gem"
-      - run: "tailwindcss --help"
-
-  darwin-arm64-install:
-    needs: ["package"]
-    runs-on: macos-14
-    steps:
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: "3.2"
-      - uses: actions/download-artifact@v4
-        with:
-          name: gem-arm64-darwin
-          path: pkg
-      - run: "gem install pkg/tailwindcss-ruby-*.gem"
-      - run: "tailwindcss --help"
-
-  windows-install:
-    needs: ["package"]
-    runs-on: windows-latest
-    steps:
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: "3.0"
-      - uses: actions/download-artifact@v4
-        with:
-          name: gem-x64-mingw32
-          path: pkg
-      - run: "gem install pkg/tailwindcss-ruby-*.gem"
-      - run: "tailwindcss --help"
-
-  windows-ucrt-install:
-    needs: ["package"]
-    runs-on: windows-2022
-    steps:
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: "3.2"
-      - uses: actions/download-artifact@v4
-        with:
-          name: gem-x64-mingw-ucrt
-          path: pkg
-      - run: "gem install pkg/tailwindcss-ruby-*.gem"
-      - run: "tailwindcss --help"
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
deleted file mode 100644
index 943726e..0000000
--- a/.github/workflows/main.yml
+++ /dev/null
@@ -1,34 +0,0 @@
-name: ci
-concurrency:
-  group: "${{github.workflow}}-${{github.ref}}"
-  cancel-in-progress: true
-on:
-  workflow_dispatch:
-  push:
-    branches:
-      - main
-      - v4*
-    tags:
-      - v*.*.*
-  pull_request:
-    types: [opened, synchronize]
-    branches:
-      - '*'
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        ruby: ["3.0", "3.1", "3.2", "3.3", "head"]
-    steps:
-      - uses: actions/checkout@v4
-      - run: rm Gemfile.lock
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: ${{matrix.ruby}}
-          bundler: latest
-          bundler-cache: true
-      - name: Run tests
-        run: bundle exec rake test
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 681448b..354d40a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,89 @@
 # tailwindcss-ruby changelog
 
+## v4.1.8
+
+* Update to [Tailwind CSS v4.1.8](https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.1.8) @flavorjones
+
+
+## v4.1.7
+
+* Update to [Tailwind CSS v4.1.7](https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.1.7) @flavorjones
+
+
+## v4.1.6
+
+* Update to [Tailwind CSS v4.1.6](https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.1.6) @flavorjones
+
+
+## v4.1.5
+
+* Update to [Tailwind CSS v4.1.5](https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.1.5) @flavorjones
+
+
+## v4.1.4
+
+* Update to [Tailwind CSS v4.1.4](https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.1.4) @flavorjones
+
+
+## v4.1.3
+
+* Update to [Tailwind CSS v4.1.3](https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.1.3) @flavorjones
+
+
+## v4.0.17
+
+* Update to [Tailwind CSS v4.0.17](https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.0.17) @flavorjones
+
+
+## v4.0.16
+
+* Update to [Tailwind CSS v4.0.16](https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.0.16) @flavorjones
+
+
+## v4.0.15
+
+* Update to [Tailwind CSS v4.0.15](https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.0.15) @flavorjones
+
+
+## v4.0.14
+
+* Update to [Tailwind CSS v4.0.14](https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.0.14) @flavorjones
+
+
+## v4.0.12
+
+* Update to [Tailwind CSS v4.0.12](https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.0.12) @flavorjones
+
+
+## v4.0.9
+
+* Update to [Tailwind CSS v4.0.9](https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.0.9) @flavorjones
+
+
+## v4.0.8
+
+* Update to [Tailwind CSS v4.0.8](https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.0.8) @flavorjones
+
+
+## v4.0.7
+
+* Update to [Tailwind CSS v4.0.7](https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.0.7) @flavorjones
+
+
+## v4.0.6
+
+* Update to [Tailwind CSS v4.0.6](https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.0.6) @flavorjones
+
+  Upgrade guide at https://tailwindcss.com/docs/upgrade-guide
+
+
+## v4.0.5
+
+* Update to [Tailwind CSS v4.0.5](https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.0.5) @flavorjones
+
+  Upgrade guide at https://tailwindcss.com/docs/upgrade-guide
+
+
 ## v4.0.4
 
 * Update to [Tailwind CSS v4.0.4](https://github.com/tailwindlabs/tailwindcss/releases/tag/v4.0.4) @flavorjones
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7a0bbc0..e4332fa 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -4,20 +4,26 @@ This doc is a brief introduction on modifying and maintaining this gem.
 
 ## Updating to the latest upstream tailwindcss version
 
-Update `lib/tailwindcss/ruby/upstream.rb` with the upstream version.
+Please don't submit PRs to the maintainer with an upstream bump.
 
-Run `bundle exec rake clobber` then `bundle exec rake download` to ensure the tailwindcss binaries can be downloaded, and that you have the correct versions on local disk.
+- [ ] run `bin/bump-upstream`
+- [ ] push the branch, create a PR
 
 ## Cutting a release of tailwindcss-ruby
 
-- bump the version
+- if it's just bumping the upstream:
+  - [ ] follow the steps above
+  - [ ] when the PR is green, merge the PR
+  - [ ] create a git tag (after updating local `main`)
+- else if the gem is being changed in some other way:
   - [ ] update `lib/tailwindcss/ruby/version.rb`
   - [ ] update `CHANGELOG.md`
-  - [ ] commit and create a git tag
+  - [ ] `git commit`
+  - [ ] `git tag`
 - build the native gems:
-  - [ ] `bundle exec rake clobber` if needed to clean up possibly-old tailwindcss executables
+  - [ ] `bundle exec rake clobber` (if needed to clean up old tailwindcss executables)
   - [ ] `bundle exec rake package`
-- push
+- push source and gems:
   - [ ] `for g in pkg/*.gem ; do gem push $g ; done`
   - [ ] `git push && git push --tags`
 - announce
diff --git a/Gemfile.lock b/Gemfile.lock
index 38de47d..db7a499 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,44 +1,44 @@
 PATH
   remote: .
   specs:
-    tailwindcss-ruby (4.0.3)
+    tailwindcss-ruby (4.1.8)
 
 GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.2)
-    json (2.9.1)
-    language_server-protocol (3.17.0.3)
+    json (2.10.2)
+    language_server-protocol (3.17.0.4)
     lint_roller (1.1.0)
     minitest (5.25.4)
     parallel (1.26.3)
-    parser (3.3.6.0)
+    parser (3.3.7.1)
       ast (~> 2.4.1)
       racc
     racc (1.8.1)
     rainbow (3.1.1)
     rake (13.2.1)
     regexp_parser (2.10.0)
-    rubocop (1.69.2)
+    rubocop (1.71.2)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
       parallel (~> 1.10)
       parser (>= 3.3.0.2)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 2.9.3, < 3.0)
-      rubocop-ast (>= 1.36.2, < 2.0)
+      rubocop-ast (>= 1.38.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 2.4.0, < 4.0)
-    rubocop-ast (1.37.0)
+    rubocop-ast (1.38.0)
       parser (>= 3.3.1.0)
     rubocop-performance (1.23.1)
       rubocop (>= 1.48.1, < 2.0)
       rubocop-ast (>= 1.31.1, < 2.0)
     ruby-progressbar (1.13.0)
-    standard (1.43.0)
+    standard (1.45.0)
       language_server-protocol (~> 3.17.0.2)
       lint_roller (~> 1.0)
-      rubocop (~> 1.69.1)
+      rubocop (~> 1.71.0)
       standard-custom (~> 1.0.0)
       standard-performance (~> 1.6)
     standard-custom (1.0.2)
@@ -47,7 +47,7 @@ GEM
     standard-performance (1.6.0)
       lint_roller (~> 1.1)
       rubocop-performance (~> 1.23.0)
-    unicode-display_width (3.1.3)
+    unicode-display_width (3.1.4)
       unicode-emoji (~> 4.0, >= 4.0.4)
     unicode-emoji (4.0.4)
 
diff --git a/README.md b/README.md
index 65a256b..debfdce 100644
--- a/README.md
+++ b/README.md
@@ -93,28 +93,20 @@ $ bundle exec which tailwindcss
 
 # run the actual executable through the shim
 $ bundle exec tailwindcss --help
-["/path/to/installs/ruby/3.3.5/lib/ruby/gems/3.3.0/gems/tailwindcss-ruby-0.1.0-x86_64-linux/exe/x86_64-linux/tailwindcss", "--help"]
-
-tailwindcss v3.4.3
+["/path/to/installs/installs/ruby/3.4.2/lib/ruby/gems/3.4.0/gems/tailwindcss-ruby-4.0.12-x86_64-linux-gnu/exe/x86_64-linux-gnu/tailwindcss", "--help"]
+≈ tailwindcss v4.0.12
 
 Usage:
-   tailwindcss [--input input.css] [--output output.css] [--watch] [options...]
-   tailwindcss init [--full] [--postcss] [options...]
-
-Commands:
-   init [options]
+  tailwindcss [--input input.css] [--output output.css] [--watch] [options…]
 
 Options:
-   -i, --input              Input file
-   -o, --output             Output file
-   -w, --watch              Watch for changes and rebuild as needed
-   -p, --poll               Use polling instead of filesystem events when watching
-       --content            Content paths to use for removing unused classes
-       --postcss            Load custom PostCSS configuration
-   -m, --minify             Minify the output
-   -c, --config             Path to a custom config file
-       --no-autoprefixer    Disable autoprefixer
-   -h, --help               Display usage information
+  -i, --input ··········· Input file
+  -o, --output ·········· Output file [default: `-`]
+  -w, --watch ··········· Watch for changes and rebuild as needed
+  -m, --minify ·········· Optimize and minify the output
+      --optimize ········ Optimize the output without minifying
+      --cwd ············· The current working directory [default: `.`]
+  -h, --help ············ Display usage information
 ```
 
 
diff --git a/bin/bump-upstream b/bin/bump-upstream
new file mode 100755
index 0000000..cb698e0
--- /dev/null
+++ b/bin/bump-upstream
@@ -0,0 +1,91 @@
+#!/usr/bin/env bash
+
+set -eu
+set -o pipefail
+
+if [[ $# -lt 1 ]] ; then
+  echo "Usage: $(basename $0) <upstream-tag>"
+  echo
+  echo "Where <upstream_version> is the tag name of the Tailwind CSS release."
+  exit 1
+fi
+
+PAGER="" # we don't want gh to use a pager
+git_cmd=$(command -v git)
+gh_cmd=$(command -v gh)
+sed_cmd=$(command -v sed)
+
+fail() {
+  echo "Error: $*" >&2
+  exit 1
+}
+
+upstream_tag=$1
+gem_version=$(echo $upstream_tag | $sed_cmd -E 's/^v//' | sed -E 's/-/./')
+gem_tag="v${gem_version}"
+
+github_user=$($git_cmd config github.user || true)
+if [[ -z "$github_user" ]]; then
+  fail "github.user is not set in git config"
+fi
+
+# view the release. will fail if the release does not exist
+$gh_cmd release view ${upstream_tag} --repo tailwindlabs/tailwindcss
+
+# get on the right starting branch
+if [[ -n "$($git_cmd status --porcelain --untracked-files=no)" ]]; then
+  fail "found uncommitted changes"
+fi
+
+if [[ $upstream_tag =~ ^v4 ]] ; then
+  base_branch="main"
+elif [[ $upstream_tag =~ ^v3 ]] ; then
+  base_branch="v3.x"
+else
+  fail "Whoa! A new major version? Need to update the ${0} script."
+fi
+
+$git_cmd switch $base_branch
+
+if ! $git_cmd rev-parse --abbrev-ref @{push} >/dev/null 2>&1; then
+  fail "current branch is not tracking a remote branch"
+fi
+
+#
+# modify the upstream version and gem version
+#
+$sed_cmd -E -i "s/^(\s+)VERSION\s+=.*/\1VERSION = \"${upstream_tag}\"/" lib/tailwindcss/ruby/upstream.rb
+$sed_cmd -E -i "s/^(\s+)VERSION\s+=.*/\1VERSION = \"${gem_version}\"/" lib/tailwindcss/ruby/version.rb
+
+bundle install
+
+#
+# modify the changelog
+#
+replacement_text=$(cat <<EOF
+## ${gem_tag}
+
+* Update to [Tailwind CSS ${upstream_tag}](https://github.com/tailwindlabs/tailwindcss/releases/tag/${upstream_tag}) @${github_user}
+EOF
+)
+# substitute newlines with '\n' so sed will do the right things
+replacement_text=$(echo "$replacement_text" | tr '\n' '\t' | sed -E 's/\t/\\n/g')
+$sed_cmd -E -i "0,/^##/{s|^##|${replacement_text}\n\n##|}" CHANGELOG.md
+
+#
+#  check if the packages match the checksums
+#
+bundle exec rake clobber download
+
+#
+#  commit to a branch
+#
+git switch -c flavorjones-dep-tailwindcss-${upstream_tag}
+git add lib CHANGELOG.md Gemfile*
+git commit -m "dep: update to Tailwind CSS ${upstream_tag}
+
+https://github.com/tailwindlabs/tailwindcss/releases/tag/${upstream_tag}
+"
+
+echo "Now push the current branch and create a PR."
+exit 0
diff --git a/lib/tailwindcss/ruby/upstream.rb b/lib/tailwindcss/ruby/upstream.rb
index 265c6d6..868b596 100644
--- a/lib/tailwindcss/ruby/upstream.rb
+++ b/lib/tailwindcss/ruby/upstream.rb
@@ -1,7 +1,7 @@
 module Tailwindcss
   module Ruby
     module Upstream
-      VERSION = "v4.0.4"
+      VERSION = "v4.1.8"
 
       # rubygems platform name => upstream release filename
       NATIVE_PLATFORMS = {
diff --git a/lib/tailwindcss/ruby/version.rb b/lib/tailwindcss/ruby/version.rb
index 719c055..3a9e190 100644
--- a/lib/tailwindcss/ruby/version.rb
+++ b/lib/tailwindcss/ruby/version.rb
@@ -2,6 +2,6 @@
 
 module Tailwindcss
   module Ruby
-    VERSION = "4.0.4"
+    VERSION = "4.1.8"
   end
 end