diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..4d95ee2
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,35 @@
+name: Test
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  workflow_call:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  install:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, macos-15-intel, ubuntu-latest, ubuntu-24.04-arm]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          # A PR tests itself; a push or the updater tests main as it now is.
+          ref: ${{ github.event.pull_request.head.sha || 'main' }}
+
+      - name: Set up Homebrew
+        uses: Homebrew/actions/setup-homebrew@main
+
+      - name: Install from this tap and test
+        run: |
+          brew tap-new --no-git local/test >/dev/null
+          cp Formula/dbdiff.rb "$(brew --repository local/test)/Formula/"
+          brew install local/test/dbdiff
+          brew test local/test/dbdiff
+          dbdiff --version
diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
new file mode 100644
index 0000000..bb2a082
--- /dev/null
+++ b/.github/workflows/update.yml
@@ -0,0 +1,62 @@
+name: Update formula
+
+# Follows DBDiff's releases: daily, or on demand for a given version. Until a
+# stable release exists the newest pre-release is used; after that, only
+# stable releases — the same rule as npm's `latest` tag for @dbdiff/cli.
+on:
+  schedule:
+    - cron: '0 5 * * *'
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'DBDiff version, no "v" (empty: the newest as above)'
+        required: false
+
+permissions:
+  contents: write
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    outputs:
+      changed: ${{ steps.commit.outputs.changed }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Pick the version
+        id: pick
+        env:
+          GH_TOKEN: ${{ github.token }}
+          WANTED: ${{ inputs.version }}
+        run: |
+          if [ -n "$WANTED" ]; then
+            version="$WANTED"
+          else
+            releases="$(gh api repos/DBDiff/DBDiff/releases --jq '[.[] | select(.draft | not)]')"
+            version="$(jq -r '[.[] | select(.prerelease | not)][0].tag_name // empty' <<< "$releases")"
+            [ -n "$version" ] || version="$(jq -r '.[0].tag_name' <<< "$releases")"
+            version="${version#v}"
+          fi
+          current="$(sed -n 's/^  version "\(.*\)"$/\1/p' Formula/dbdiff.rb)"
+          echo "current $current, wanted $version"
+          echo "version=$version" >> "$GITHUB_OUTPUT"
+          [ "$version" != "$current" ] && echo "update=true" >> "$GITHUB_OUTPUT" || true
+
+      - name: Rewrite the formula
+        if: steps.pick.outputs.update == 'true'
+        run: scripts/update-formula.sh "${{ steps.pick.outputs.version }}"
+
+      - name: Commit
+        id: commit
+        if: steps.pick.outputs.update == 'true'
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git commit -am "dbdiff ${{ steps.pick.outputs.version }}"
+          git push
+          echo "changed=true" >> "$GITHUB_OUTPUT"
+
+  test:
+    needs: update
+    if: needs.update.outputs.changed == 'true'
+    uses: ./.github/workflows/test.yml
diff --git a/Formula/dbdiff.rb b/Formula/dbdiff.rb
index 2eeeb26..29e3bd7 100644
--- a/Formula/dbdiff.rb
+++ b/Formula/dbdiff.rb
@@ -1,56 +1,38 @@
+# Written by scripts/update-formula.sh — edit that, not this.
 class Dbdiff < Formula
-  desc "Compare MySQL, Postgres or SQLite databases & generate schema/data migrations"
+  desc "Diff MySQL, PostgreSQL and SQLite databases and generate migrations"
   homepage "https://github.com/DBDiff/DBDiff"
+  version "3.0.0-rc.27"
   license "MIT"
-  version "2.0.0"
 
-  # ── Platform-specific binary downloads ──────────────────────────────────────
-  # ── Platform-specific binary downloads ──────────────────────────────────────
-  #
-  # SHA256 values are stamped by scripts/update-homebrew-formula.sh after each
-  # GitHub release is published.  Run:
-  #
-  #   scripts/update-homebrew-formula.sh 2.0.1 ../homebrew-dbdiff
-  #
+  # A self-contained static binary per platform: PHP and DBDiff in one file.
   on_macos do
     on_arm do
       url "https://github.com/DBDiff/DBDiff/releases/download/v#{version}/dbdiff-darwin-arm64"
-      sha256 "PLACEHOLDER_darwin_arm64" # bumped by update-homebrew-formula.sh
+      sha256 "f62cb84c35787526e2f596abb3aa1a98f10e67b984b99316221bac08f5b575e3"
     end
     on_intel do
       url "https://github.com/DBDiff/DBDiff/releases/download/v#{version}/dbdiff-darwin-x64"
-      sha256 "PLACEHOLDER_darwin_x64" # bumped by update-homebrew-formula.sh
+      sha256 "759f1661e1acb16f8c2369ae2dfa96dc3dd73afee5c41ce55352ce57ec192565"
     end
   end
 
   on_linux do
     on_arm do
       url "https://github.com/DBDiff/DBDiff/releases/download/v#{version}/dbdiff-linux-arm64"
-      sha256 "PLACEHOLDER_linux_arm64" # bumped by update-homebrew-formula.sh
+      sha256 "dc562dc2cc6bf9c8f8d616f974d4f19d947e5c393354cfd9869b8415aab31ae9"
     end
     on_intel do
       url "https://github.com/DBDiff/DBDiff/releases/download/v#{version}/dbdiff-linux-x64"
-      sha256 "PLACEHOLDER_linux_x64" # bumped by update-homebrew-formula.sh
+      sha256 "85444249d9db0d029bfeafae7379cca98e435d9f9306c2b16e355be80cfea492"
     end
   end
 
-  # No compilation — the binary is a fully self-contained static executable
-  # (static PHP micro SAPI + DBDiff PHAR combined into a single file)
-  bottle :unneeded
-
   def install
-    # Determine the asset filename downloaded by Homebrew for this platform
-    asset = if OS.mac?
-      Hardware::CPU.arm? ? "dbdiff-darwin-arm64" : "dbdiff-darwin-x64"
-    else
-      Hardware::CPU.arm? ? "dbdiff-linux-arm64" : "dbdiff-linux-x64"
-    end
-
-    bin.install asset => "dbdiff"
+    bin.install Dir["dbdiff-*"].first => "dbdiff"
   end
 
   test do
-    output = shell_output("#{bin}/dbdiff --version")
-    assert_match "DBDiff #{version}", output
+    assert_match "DBDiff #{version}", shell_output("#{bin}/dbdiff --version")
   end
 end
diff --git a/README.md b/README.md
index 17582c7..63a8454 100644
--- a/README.md
+++ b/README.md
@@ -1,46 +1,44 @@
 # homebrew-dbdiff
 
-[Homebrew](https://brew.sh) tap for [DBDiff](https://github.com/DBDiff/DBDiff) — the database diff and migration tool for MySQL, Postgres, and SQLite.
+[Homebrew](https://brew.sh) tap for [DBDiff](https://github.com/DBDiff/DBDiff):
+diff MySQL, PostgreSQL and SQLite databases and generate migrations. It
+installs DBDiff's self-contained binary — no PHP needed — on macOS and Linux,
+Apple Silicon, Intel and ARM.
 
 ## Install
 
 ```bash
-brew tap DBDiff/dbdiff
-brew install dbdiff
+brew install dbdiff/dbdiff/dbdiff
 ```
 
+or `brew tap dbdiff/dbdiff` then `brew install dbdiff`.
+
 ## Usage
 
 ```bash
-# Diff two MySQL schemas
-dbdiff user:pass@host:3306 db1:db2
-
-# Diff two Postgres schemas (full DSN)
-dbdiff --server1-url postgres://user:pass@host:5432/db1 \
-       --server2-url postgres://user:pass@host:5432/db2
+# Schema and data, Postgres to Postgres, from connection strings
+dbdiff diff --server1-url postgres://user:pass@host:5432/staging \
+            --server2-url postgres://user:pass@host:5432/production \
+            --type=all --include=both --output=migration.sql
 
-# Supabase shorthand
-dbdiff --supabase --server1=user:pass@db.abc.supabase.co:5432 db1:db2
+# MySQL, two databases on one server
+dbdiff diff --server1=user:pass@localhost:3306 --type=schema app_dev:app_prod
 
-# Generate a migration file in a specific format
-dbdiff --format=laravel user:pass@host:3306 db1:db2
+# SQLite files
+dbdiff diff --server1-url sqlite:///path/to/a.db --server2-url sqlite:///path/to/b.db
 ```
 
+`dbdiff diff --help` lists every option. See the
+[DBDiff README](https://github.com/DBDiff/DBDiff#readme) for the rest.
+
 ## Upgrade
 
 ```bash
-brew upgrade dbdiff
+brew update && brew upgrade dbdiff
 ```
 
-## Uninstall
-
-```bash
-brew uninstall dbdiff
-brew untap DBDiff/dbdiff
-```
+The formula follows DBDiff's releases automatically.
 
-## More information
+## License
 
-- **GitHub:** https://github.com/DBDiff/DBDiff
-- **npm:** `npm install -g @dbdiff/cli`
-- **Issues:** https://github.com/DBDiff/DBDiff/issues
+MIT
diff --git a/package.json b/package.json
deleted file mode 100644
index 415581d..0000000
--- a/package.json
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-  "name": "homebrew-dbdiff",
-  "version": "1.0.0",
-  "main": "index.js",
-  "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
-  },
-  "author": "",
-  "license": "ISC",
-  "description": ""
-}
diff --git a/scripts/update-formula.sh b/scripts/update-formula.sh
new file mode 100755
index 0000000..670f572
--- /dev/null
+++ b/scripts/update-formula.sh
@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+# Rewrite Formula/dbdiff.rb for a DBDiff release: its version and the SHA-256
+# of each platform binary, read from the release's assets.
+#
+#   scripts/update-formula.sh 3.0.0-rc.27
+set -euo pipefail
+
+version="${1:?usage: $0 <version>   e.g. 3.0.0-rc.27}"
+base="https://github.com/DBDiff/DBDiff/releases/download/v${version}"
+cd "$(dirname "$0")/.."
+
+sha() {
+  local sum
+  sum="$(curl -fsSL "$base/$1" | sha256sum | cut -d' ' -f1)"
+  [ ${#sum} -eq 64 ] || { echo "could not download $base/$1" >&2; exit 1; }
+  echo "$sum"
+}
+
+darwin_arm64="$(sha dbdiff-darwin-arm64)"
+darwin_x64="$(sha dbdiff-darwin-x64)"
+linux_arm64="$(sha dbdiff-linux-arm64)"
+linux_x64="$(sha dbdiff-linux-x64)"
+
+cat > Formula/dbdiff.rb <<RUBY
+# Written by scripts/update-formula.sh — edit that, not this.
+class Dbdiff < Formula
+  desc "Diff MySQL, PostgreSQL and SQLite databases and generate migrations"
+  homepage "https://github.com/DBDiff/DBDiff"
+  version "${version}"
+  license "MIT"
+
+  # A self-contained static binary per platform: PHP and DBDiff in one file.
+  on_macos do
+    on_arm do
+      url "https://github.com/DBDiff/DBDiff/releases/download/v#{version}/dbdiff-darwin-arm64"
+      sha256 "${darwin_arm64}"
+    end
+    on_intel do
+      url "https://github.com/DBDiff/DBDiff/releases/download/v#{version}/dbdiff-darwin-x64"
+      sha256 "${darwin_x64}"
+    end
+  end
+
+  on_linux do
+    on_arm do
+      url "https://github.com/DBDiff/DBDiff/releases/download/v#{version}/dbdiff-linux-arm64"
+      sha256 "${linux_arm64}"
+    end
+    on_intel do
+      url "https://github.com/DBDiff/DBDiff/releases/download/v#{version}/dbdiff-linux-x64"
+      sha256 "${linux_x64}"
+    end
+  end
+
+  def install
+    bin.install Dir["dbdiff-*"].first => "dbdiff"
+  end
+
+  test do
+    assert_match "DBDiff #{version}", shell_output("#{bin}/dbdiff --version")
+  end
+end
+RUBY
+echo "Formula/dbdiff.rb → ${version}"