diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2444c6f..3113d63 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,7 +26,7 @@ jobs:
           extensions: mbstring, intl, mysql, zlib, dom, openssl, soap, json, simplexml, libxml
 
       - name: checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Composer Install
         run: |
diff --git a/src/Signer.php b/src/Signer.php
index d6b4e44..4cb5dc1 100755
--- a/src/Signer.php
+++ b/src/Signer.php
@@ -286,6 +286,7 @@ public static function digestCheck($xml, $tagname = '', $canonical = self::CANON
             } else {
                 $xpath = new \DOMXPath($dom);
                 $entries = $xpath->query('//@Id');
+                /** @var \DOMAttr $entry */
                 foreach ($entries as $entry) {
                     $tagname = $entry->ownerElement->nodeName;
                     break;