diff --git a/src/Monolog/Handler/SendGridHandler.php b/src/Monolog/Handler/SendGridHandler.php
index 9c3b8e6a..5847a585 100644
--- a/src/Monolog/Handler/SendGridHandler.php
+++ b/src/Monolog/Handler/SendGridHandler.php
@@ -12,9 +12,10 @@
 namespace Monolog\Handler;
 
 use Monolog\Level;
+use Monolog\Utils;
 
 /**
- * SendGridrHandler uses the SendGrid API v2 function to send Log emails, more information in https://sendgrid.com/docs/API_Reference/Web_API/mail.html
+ * SendGridHandler uses the SendGrid API v3 function to send Log emails, more information in https://www.twilio.com/docs/sendgrid/for-developers/sending-email/api-getting-started
  *
  * @author Ricardo Fontanelli <ricardo.fontanelli@hotmail.com>
  */
@@ -22,19 +23,9 @@ class SendGridHandler extends MailHandler
 {
     /**
      * The SendGrid API User
+     * @deprecated this is not used anymore as of SendGrid API v3
      */
     protected string $apiUser;
-
-    /**
-     * The SendGrid API Key
-     */
-    protected string $apiKey;
-
-    /**
-     * The email addresses to which the message will be sent
-     */
-    protected string $from;
-
     /**
      * The email addresses to which the message will be sent
      * @var string[]
@@ -42,59 +33,63 @@ class SendGridHandler extends MailHandler
     protected array $to;
 
     /**
-     * The subject of the email
-     */
-    protected string $subject;
-
-    /**
-     * @param string          $apiUser The SendGrid API User
-     * @param string          $apiKey  The SendGrid API Key
-     * @param string          $from    The sender of the email
-     * @param string|string[] $to      The recipients of the email
-     * @param string          $subject The subject of the mail
-     *
+     * @param string|null $apiUser Unused user as of SendGrid API v3, you can pass null or any string
+     * @param list<string>|string $to
+     * @param non-empty-string $apiHost Allows you to use another endpoint (e.g. api.eu.sendgrid.com)
      * @throws MissingExtensionException If the curl extension is missing
      */
-    public function __construct(string $apiUser, string $apiKey, string $from, string|array $to, string $subject, int|string|Level $level = Level::Error, bool $bubble = true)
-    {
+    public function __construct(
+        string|null $apiUser,
+        protected string $apiKey,
+        protected string $from,
+        array|string $to,
+        protected string $subject,
+        int|string|Level $level = Level::Error,
+        bool $bubble = true,
+        /** @var non-empty-string */
+        private readonly string $apiHost = 'api.sendgrid.com',
+    ) {
         if (!\extension_loaded('curl')) {
             throw new MissingExtensionException('The curl extension is needed to use the SendGridHandler');
         }
 
-        parent::__construct($level, $bubble);
-        $this->apiUser = $apiUser;
-        $this->apiKey = $apiKey;
-        $this->from = $from;
         $this->to = (array) $to;
-        $this->subject = $subject;
+        // @phpstan-ignore property.deprecated
+        $this->apiUser = $apiUser ?? '';
+        parent::__construct($level, $bubble);
     }
 
-    /**
-     * @inheritDoc
-     */
     protected function send(string $content, array $records): void
     {
-        $message = [];
-        $message['api_user'] = $this->apiUser;
-        $message['api_key'] = $this->apiKey;
-        $message['from'] = $this->from;
+        $body = [];
+        $body['personalizations'] = [];
+        $body['from']['email'] = $this->from;
         foreach ($this->to as $recipient) {
-            $message['to[]'] = $recipient;
+            $body['personalizations'][]['to'][]['email'] = $recipient;
         }
-        $message['subject'] = $this->subject;
-        $message['date'] = date('r');
+        $body['subject'] = $this->subject;
 
         if ($this->isHtmlBody($content)) {
-            $message['html'] = $content;
+            $body['content'][] = [
+                'type' => 'text/html',
+                'value' => $content,
+            ];
         } else {
-            $message['text'] = $content;
+            $body['content'][] = [
+                'type' => 'text/plain',
+                'value' => $content,
+            ];
         }
-
         $ch = curl_init();
-        curl_setopt($ch, CURLOPT_URL, 'https://api.sendgrid.com/api/mail.send.json');
+        curl_setopt($ch, CURLOPT_HTTPHEADER, [
+            'Content-Type: application/json',
+            'Authorization: Bearer '.$this->apiKey,
+        ]);
+        curl_setopt($ch, CURLOPT_URL, 'https://'.$this->apiHost.'/v3/mail/send');
         curl_setopt($ch, CURLOPT_POST, true);
         curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
-        curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($message));
+        curl_setopt($ch, CURLOPT_POSTFIELDS, Utils::jsonEncode($body));
+
         Curl\Util::execute($ch, 2);
     }
 }