diff --git a/includes/utils.php b/includes/utils.php
index ef1b4772e..4c2bc30e7 100644
--- a/includes/utils.php
+++ b/includes/utils.php
@@ -912,7 +912,10 @@ function process_media( $url, $post_id, $args = [] ) {
 			'jpeg',
 			'jpe',
 			'gif',
-			'png'
+			'png',
+			'webp',
+			'heic',
+			'avif',
 		),
 		$url,
 		$post_id
diff --git a/tests/php/includes/common.php b/tests/php/includes/common.php
index d7ba845c9..e8c2a1645 100644
--- a/tests/php/includes/common.php
+++ b/tests/php/includes/common.php
@@ -266,6 +266,9 @@ function get_allowed_mime_types() {
 		'bmp'          => 'image/bmp',
 		'tif|tiff'     => 'image/tiff',
 		'ico'          => 'image/x-icon',
+		'webp'         => 'image/webp',
+		'heic'         => 'image/heic',
+		'avif'         => 'image/avif',
 	];
 }