diff --git a/rector.php b/rector.php
index 8e111bb..cb14d8a 100644
--- a/rector.php
+++ b/rector.php
@@ -9,6 +9,6 @@
         __DIR__ . '/src',
         __DIR__ . '/tests',
     ])
-    ->withPhpSets(php80: true)
+    ->withPhpSets(php81: true)
     ->withImportNames(importShortClasses: false)
     ->withTypeCoverageLevel(0);
diff --git a/src/Analysis/Analysis.php b/src/Analysis/Analysis.php
index e4c5df8..c34f30d 100644
--- a/src/Analysis/Analysis.php
+++ b/src/Analysis/Analysis.php
@@ -72,7 +72,7 @@ public function getContent()
         $parser = $this->getRenderedHtmlDomParser();
         $output = [];
         foreach ($parser->find('p,h1,h2,h3,h4,h5') as $item) {
-            $output[] = strip_tags(html_entity_decode($item->innertext()));
+            $output[] = strip_tags(html_entity_decode((string) $item->innertext()));
         }
 
         $output = array_filter($output);
diff --git a/src/Builders/FacebookMetaGenerator.php b/src/Builders/FacebookMetaGenerator.php
index 33af790..5886495 100644
--- a/src/Builders/FacebookMetaGenerator.php
+++ b/src/Builders/FacebookMetaGenerator.php
@@ -105,11 +105,11 @@ public function process()
         $tags = [];
 
         if ($this->getTitle()) {
-            $tags[] = sprintf('<meta property="og:title" content="%s"/>', htmlentities($this->getTitle()));
+            $tags[] = sprintf('<meta property="og:title" content="%s"/>', htmlentities((string) $this->getTitle()));
         }
 
         if ($this->getDescription()) {
-            $tags[] = sprintf('<meta property="og:description" content="%s"/>', htmlentities($this->getDescription()));
+            $tags[] = sprintf('<meta property="og:description" content="%s"/>', htmlentities((string) $this->getDescription()));
         }
 
         if ($this->getType()) {
@@ -174,7 +174,7 @@ public function setImageHeight($height)
      */
     public function setImageUrl(mixed $imageUrl)
     {
-        if ($imageUrl && (str_starts_with($imageUrl, '/') || !str_starts_with($imageUrl, 'http'))) {
+        if ($imageUrl && (str_starts_with((string) $imageUrl, '/') || !str_starts_with((string) $imageUrl, 'http'))) {
             throw new \InvalidArgumentException(
                 'A relative or invalid URL was detected; you must provide the full absolute URL'
             );
@@ -228,7 +228,7 @@ public function setType(mixed $type)
      */
     public function setUrl(mixed $url)
     {
-        if ($url && (str_starts_with($url, '/') || !str_starts_with($url, 'http'))) {
+        if ($url && (str_starts_with((string) $url, '/') || !str_starts_with((string) $url, 'http'))) {
             throw new \InvalidArgumentException(
                 'A relative URL was detected; you must provide the full absolute URL instead'
             );
diff --git a/src/Builders/TwitterMetaGenerator.php b/src/Builders/TwitterMetaGenerator.php
index ac12865..ee07a8e 100644
--- a/src/Builders/TwitterMetaGenerator.php
+++ b/src/Builders/TwitterMetaGenerator.php
@@ -95,11 +95,11 @@ public function process()
 
         $tags[] = '<meta name="twitter:card" content="summary"/>';
         if ($this->getTitle()) {
-            $tags[] = sprintf('<meta name="twitter:title" content="%s"/>', htmlentities($this->getTitle()));
+            $tags[] = sprintf('<meta name="twitter:title" content="%s"/>', htmlentities((string) $this->getTitle()));
         }
 
         if ($this->getDescription()) {
-            $tags[] = sprintf('<meta name="twitter:description" content="%s"/>', htmlentities($this->getDescription()));
+            $tags[] = sprintf('<meta name="twitter:description" content="%s"/>', htmlentities((string) $this->getDescription()));
         }
 
         if ($this->getImageUrl()) {
@@ -143,7 +143,7 @@ public function setDescription(mixed $description)
      */
     public function setImageUrl(mixed $imageUrl)
     {
-        if ($imageUrl && (str_starts_with($imageUrl, '/') || !str_starts_with($imageUrl, 'http'))) {
+        if ($imageUrl && (str_starts_with((string) $imageUrl, '/') || !str_starts_with((string) $imageUrl, 'http'))) {
             throw new \InvalidArgumentException(
                 'A relative or invalid URL was detected, your must provide the full absolute URL'
             );
diff --git a/src/Extensions/PageSeoExtension.php b/src/Extensions/PageSeoExtension.php
index 4c10d89..5b030cc 100644
--- a/src/Extensions/PageSeoExtension.php
+++ b/src/Extensions/PageSeoExtension.php
@@ -80,7 +80,7 @@ class PageSeoExtension extends DataExtension
      */
     public function MetaTags(&$tags)
     {
-        $tags = explode(PHP_EOL, $tags);
+        $tags = explode(PHP_EOL, (string) $tags);
         $tags = array_merge(
             $tags,
             Seo::getCanonicalUrlLink($this->getOwner()),
diff --git a/src/Forms/GoogleSearchPreview.php b/src/Forms/GoogleSearchPreview.php
index 2a9f605..60133be 100644
--- a/src/Forms/GoogleSearchPreview.php
+++ b/src/Forms/GoogleSearchPreview.php
@@ -92,10 +92,10 @@ public function limitDescriptionLength($text) {
     public function highlight($haystack, $needle)
     {
         if (!$needle) {
-            return strip_tags($haystack);
+            return strip_tags((string) $haystack);
         }
 
-        return preg_replace('/\b(' . $needle . ')\b/i', '<strong>$0</strong>', strip_tags($haystack));
+        return preg_replace('/\b(' . $needle . ')\b/i', '<strong>$0</strong>', strip_tags((string) $haystack));
     }
 
     /**
diff --git a/src/Seo.php b/src/Seo.php
index 825d8ff..bcfb654 100644
--- a/src/Seo.php
+++ b/src/Seo.php
@@ -144,7 +144,7 @@ public static function getPixels()
         $ours       = array_keys(SiteConfigSettingsExtension::config()->get('db'));
         $db         = SiteConfig::config()->get('db');
         foreach ($db as $k => $v) {
-            if (strstr($k, 'Pixel') && in_array($k, $ours)) {
+            if (strstr((string) $k, 'Pixel') && in_array($k, $ours)) {
                 if (is_null($siteConfig->{$k})) {
                     continue;
                 }