diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 42a4a98..e51e7a8 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -77,7 +77,7 @@ jobs:
         run: ./cc-test-reporter format-coverage -o codeclimate.json
 
       - name: Upload coverage file artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.php-version }}-${{ matrix.dependencies }}
           path: codeclimate.json
diff --git a/src/Header/Header.php b/src/Header/Header.php
index e9f438c..06473dc 100644
--- a/src/Header/Header.php
+++ b/src/Header/Header.php
@@ -66,6 +66,11 @@ class Header
      */
     public $length;
 
+    /**
+     * @var string
+     */
+    public $backlist;
+
     public function __construct(array $properties = [])
     {
         foreach ($properties as $property => $value) {