diff --git a/composer.json b/composer.json
index 51655a25..4fa85a9b 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
 	},
 	"require": {
 		"php": ">=8.2",
-		"erusev/parsedown": "~1.7.4",
+		"erusev/parsedown": "~1.8.0",
 		"mustangostang/spyc": "^0.6.3"
 	},
 	"extra": {
diff --git a/inc/class-markdownparser.php b/inc/class-markdownparser.php
index 1702a76f..3de2b498 100644
--- a/inc/class-markdownparser.php
+++ b/inc/class-markdownparser.php
@@ -176,12 +176,17 @@ protected function inlineInternalLink( $result, $parts ) {
 	 */
 	protected function blockHeader( $data ) {
 		$block = parent::blockHeader( $data );
-		$id = sanitize_title_with_dashes( $block['element']['text'] );
+		if ( empty( $block ) ) {
+			return $block;
+		}
+
+		$text = $block['element']['handler']['argument'];
+		$id = sanitize_title_with_dashes( $text );
 
 		// Use a manual ID if provided.
-		if ( preg_match( '/^(.+) ?\{#(.+?)\}$/', $block['element']['text'], $matches ) ) {
+		if ( preg_match( '/^(.+) ?\{#(.+?)\}$/', $text, $matches ) ) {
 			$id = $matches[2];
-			$block['element']['text'] = $matches[1];
+			$block['element']['handler']['argument'] = $matches[1];
 		}
 
 		return [
@@ -192,8 +197,7 @@ protected function blockHeader( $data ) {
 					'id' => $id,
 					'class' => 'header-anchor',
 				],
-				'handler' => 'elements',
-				'text' => [ $block['element'] ],
+				'elements' => [ $block['element'] ],
 			],
 		];
 	}