diff --git a/.github/workflows/phpunit-extensions.yml b/.github/workflows/phpunit-extensions.yml
new file mode 100644
index 00000000..a1bf4abd
--- /dev/null
+++ b/.github/workflows/phpunit-extensions.yml
@@ -0,0 +1,136 @@
+name: PHPUnit Tests - Extensions
+on: push
+permissions:
+  contents: read
+jobs:
+  phpunit-extensions:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    strategy:
+      matrix:
+        postgres_version: [ 15, 16, 17 ]
+
+    services:
+      pgsql_test:
+        image: postgres:${{ matrix.postgres_version }}
+        env:
+          PGPASSWORD: 'root'
+          POSTGRES_DB: 'laravel'
+          POSTGRES_USER: 'root'
+          POSTGRES_PASSWORD: 'root'
+        ports:
+          - 5432:5432
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+      gotenberg:
+        image: gotenberg/gotenberg:8
+        ports:
+          - 3000:3000
+        options: >-
+          --health-cmd "curl --silent --fail http://localhost:3000/health"
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@v7
+
+      - name: "Setup PHP"
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.3'
+          extensions: dom, curl, libxml, mbstring, zip, pcntl, pdo, sqlite, pdo_sqlite, bcmath, soap, intl, gd, exif, iconv
+          coverage: pcov
+
+      - uses: actions/setup-node@v7
+        with:
+          node-version: '20.x'
+
+      - name: "Read extension manifest"
+        id: extension-manifest
+        run: |
+          {
+            echo "billing_repository=$(jq -r '.Billing.repository' extensions/manifest.json)"
+            echo "billing_ref=$(jq -r '.Billing.ref' extensions/manifest.json)"
+            echo "services_repository=$(jq -r '.Services.repository' extensions/manifest.json)"
+            echo "services_ref=$(jq -r '.Services.ref' extensions/manifest.json)"
+            echo "invoicing_repository=$(jq -r '.Invoicing.repository' extensions/manifest.json)"
+            echo "invoicing_ref=$(jq -r '.Invoicing.ref' extensions/manifest.json)"
+          } >> "$GITHUB_OUTPUT"
+
+      - name: "Checkout billing extension"
+        uses: actions/checkout@v7
+        with:
+          repository: ${{ steps.extension-manifest.outputs.billing_repository }}
+          ref: ${{ steps.extension-manifest.outputs.billing_ref }}
+          path: extensions/Billing
+          ssh-key: ${{ secrets.SSH_PRIVATE_KEY_BILLING_EXTENSION }}
+
+      - name: "Install composer dependencies in billing extension"
+        working-directory: extensions/Billing
+        env:
+          COMPOSER_AUTH: '{"http-basic": {"spark.laravel.com": {"username": "contact@solidtime.io", "password": "${{ secrets.LARAVEL_SPARK_API_KEY }}"}}}'
+        run: composer install -n --prefer-dist --ignore-platform-reqs
+
+      - name: "Install npm dependencies in billing extension"
+        run: cd extensions/Billing && npm ci
+
+      - name: "Checkout services extension"
+        uses: actions/checkout@v7
+        with:
+          repository: ${{ steps.extension-manifest.outputs.services_repository }}
+          ref: ${{ steps.extension-manifest.outputs.services_ref }}
+          path: extensions/Services
+          ssh-key: ${{ secrets.SSH_PRIVATE_KEY_SERVICES_EXTENSION }}
+
+      - name: "Install composer dependencies in services extension"
+        working-directory: extensions/Services
+        run: composer install -n --prefer-dist --ignore-platform-reqs
+
+      - name: "Install npm dependencies in services extension"
+        run: cd extensions/Services && npm ci
+
+      - name: "Checkout invoicing extension"
+        uses: actions/checkout@v7
+        with:
+          repository: ${{ steps.extension-manifest.outputs.invoicing_repository }}
+          ref: ${{ steps.extension-manifest.outputs.invoicing_ref }}
+          path: extensions/Invoicing
+          ssh-key: ${{ secrets.SSH_PRIVATE_KEY_INVOICING_EXTENSION }}
+
+      - name: "Install composer dependencies in invoicing extension"
+        working-directory: extensions/Invoicing
+        run: composer install -n --prefer-dist --ignore-platform-reqs
+
+      - name: "Install npm dependencies in invoicing extension"
+        run: cd extensions/Invoicing && npm ci
+
+      - name: "Run composer install"
+        run: composer install -n --prefer-dist --ignore-platform-reqs
+
+      - name: "Activate billing extension"
+        run: php artisan module:enable Billing
+
+      - name: "Activate services extension"
+        run: php artisan module:enable Services
+
+      - name: "Activate invoicing extension"
+        run: php artisan module:enable Invoicing
+
+      - name: "Install dependencies"
+        run: npm ci
+
+      - name: "Build Frontend"
+        run: npm run build
+
+      - name: "Prepare Laravel Application"
+        run: |
+          cp .env.ci .env
+          php artisan key:generate
+          php artisan passport:keys
+
+      - name: "Run PHPUnit"
+        run: php artisan test extensions/Billing/tests extensions/Services/tests extensions/Invoicing/tests --stop-on-failure
diff --git a/extensions/manifest.json b/extensions/manifest.json
index 8b6b61db..6323bf39 100644
--- a/extensions/manifest.json
+++ b/extensions/manifest.json
@@ -1,7 +1,7 @@
 {
     "Billing": {
         "repository": "solidtime-io/extension-billing",
-        "ref": "v0.0.6"
+        "ref": "main"
     },
     "Services": {
         "repository": "solidtime-io/extension-services",