diff --git a/composer.json b/composer.json
index 2bc54a8..0820c4d 100755
--- a/composer.json
+++ b/composer.json
@@ -2,7 +2,7 @@
     "name": "by/first-image",
     "description": "A plugin to get first image from Redactor Field.",
     "type": "craft-plugin",
-    "version": "1.1.0",
+    "version": "2.0.0",
     "keywords": [
         "craft",
         "cms",
@@ -22,7 +22,7 @@
         }
     ],
     "require": {
-        "craftcms/cms": "^3.0.0"
+        "craftcms/cms": "^4.0.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/FirstImage.php b/src/FirstImage.php
index 8a78a43..5401a75 100755
--- a/src/FirstImage.php
+++ b/src/FirstImage.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * First Image plugin for Craft CMS 3.x
+ * First Image plugin for Craft CMS 4.x
  *
- * A plugin to get first image from Redactor Field.
+ * A plugin to get first image from Redactor Field.
  *
- * @link      http://sidd3.com
+ * @link      https://360adaptive.com
  * @copyright Copyright (c) 2018 Bhashkar Yadav
  */
 
@@ -24,7 +24,7 @@
  *
  * @author    Bhashkar Yadav
  * @package   FirstImage
- * @since     1.0.0
+ * @since     2.0.0
  *
  */
 class FirstImage extends Plugin
@@ -43,7 +43,7 @@ class FirstImage extends Plugin
     /**
      * @var string
      */
-    public $schemaVersion = '1.0.0';
+    public string $schemaVersion = '1.0.0';
 
     // Public Methods
     // =========================================================================
diff --git a/src/translations/en/first-image.php b/src/translations/en/first-image.php
index 3c12d08..0f97266 100755
--- a/src/translations/en/first-image.php
+++ b/src/translations/en/first-image.php
@@ -1,17 +1,17 @@
 <?php
 /**
- * First Image plugin for Craft CMS 3.x
+ * First Image plugin for Craft CMS 4.x
  *
- * A plugin to get first image from Redactor Field.
+ * A plugin to get first image from Redactor Field.
  *
- * @link      http://sidd3.com
+ * @link      https://360adaptive.com
  * @copyright Copyright (c) 2018 Bhashkar Yadav
  */
 
 /**
  * @author    Bhashkar Yadav
  * @package   FirstImage
- * @since     1.0.0
+ * @since     2.0.0
  */
 return [
     'First Image plugin loaded' => 'First Image plugin loaded',
diff --git a/src/twigextensions/FirstImageTwigExtension.php b/src/twigextensions/FirstImageTwigExtension.php
index 8e84bfd..33827bb 100755
--- a/src/twigextensions/FirstImageTwigExtension.php
+++ b/src/twigextensions/FirstImageTwigExtension.php
@@ -1,10 +1,10 @@
 <?php
 /**
- * First Image plugin for Craft CMS 3.x
+ * First Image plugin for Craft CMS 4.x
  *
- * A plugin to get first image from Redactor Field.
+ * A plugin to get first image from Redactor Field.
  *
- * @link      http://sidd3.com
+ * @link      https://360adaptive.com
  * @copyright Copyright (c) 2018 Bhashkar Yadav
  */
 
@@ -18,9 +18,9 @@
 /**
  * @author    Bhashkar Yadav
  * @package   FirstImage
- * @since     1.0.0
+ * @since     2.0.0
  */
-class FirstImageTwigExtension extends \Twig_Extension
+class FirstImageTwigExtension extends \Twig\Extension\AbstractExtension
 {
     // Public Methods
     // =========================================================================
@@ -39,7 +39,7 @@ public function getName()
     public function getFilters()
     {
         return [
-            new \Twig_SimpleFilter('getFirstImage', [$this, 'get_first_image']),
+            new \Twig\TwigFilter('getFirstImage', [$this, 'get_first_image']),
         ];
     }
 
@@ -49,7 +49,7 @@ public function getFilters()
     public function getFunctions()
     {
         return [
-            new \Twig_SimpleFunction('getFirstImage', [$this, 'get_first_image']),
+            new \Twig\TwigFunction('getFirstImage', [$this, 'get_first_image']),
         ];
     }