diff --git a/composer.json b/composer.json
index 3462de2..b6a37ae 100644
--- a/composer.json
+++ b/composer.json
@@ -17,8 +17,8 @@
         "ext-dom":"*",
         "ext-libxml":"*",
         "symfony/polyfill-mbstring": "~1.0",
-        "symfony/dom-crawler":"^6",
-        "symfony/css-selector":"^6"
+        "symfony/dom-crawler":"^6.0 || ^7.0",
+        "symfony/css-selector":"^6.0 || ^7.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^9",
diff --git a/src/HtmlPageCrawler.php b/src/HtmlPageCrawler.php
index f786a37..541d20a 100644
--- a/src/HtmlPageCrawler.php
+++ b/src/HtmlPageCrawler.php
@@ -921,7 +921,7 @@ public function filterXPath($xpath): static
      *
      * @return null|void
      */
-    public function addContent($content, $type = null)
+    public function addContent($content, $type = null): void
     {
         if (empty($type)) {
             $type = 'text/html;charset=UTF-8';
@@ -956,11 +956,11 @@ public function addHtmlFragment($content, $charset = 'UTF-8')
      *
      * Overwritten from parent to allow Crawler to be added
      *
-     * @param null|\DOMNodeList|array|\DOMNode|Crawler $node A node
+     * @param \DOMNodeList|\DOMNode|array|string|Crawler|null $node A node
      *
      * @api
      */
-    public function add($node)
+    public function add(\DOMNodeList|\DOMNode|array|string|Crawler|null $node): void
     {
         if ($node instanceof Crawler) {
             foreach ($node as $childnode) {