diff --git a/CHANGELOG.md b/CHANGELOG.md
index 512475a..89b5630 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+# v3.6.2
+## 01/12/2022
+
+1. [](#new)
+   * Support for `YubiKey OTP` 2-Factor authenticator
+   * Requires Grav `v1.7.27`
+
 # v3.6.1
 ## 01/03/2022
 
diff --git a/blueprints.yaml b/blueprints.yaml
index 174860a..c771ca5 100644
--- a/blueprints.yaml
+++ b/blueprints.yaml
@@ -1,7 +1,7 @@
 name: Login
 slug: login
 type: plugin
-version: 3.6.1
+version: 3.6.2
 testing: false
 description: Enables user authentication and login screen.
 icon: sign-in
@@ -15,7 +15,7 @@ bugs: https://github.com/getgrav/grav-plugin-login/issues
 license: MIT
 
 dependencies:
-  - { name: grav, version: '>=1.7.21' }
+  - { name: grav, version: '>=1.7.27' }
   - { name: form, version: '>=5.1.0' }
   - { name: email, version: '>=3.1.0' }
 
diff --git a/classes/TwoFactorAuth/TwoFactorAuth.php b/classes/TwoFactorAuth/TwoFactorAuth.php
index 091480e..ee29292 100644
--- a/classes/TwoFactorAuth/TwoFactorAuth.php
+++ b/classes/TwoFactorAuth/TwoFactorAuth.php
@@ -10,8 +10,14 @@
 namespace Grav\Plugin\Login\TwoFactorAuth;
 
 use Grav\Common\Grav;
+use Grav\Common\HTTP\Client;
+use Grav\Common\Utils;
 use RobThree\Auth\TwoFactorAuth as Auth;
 use RobThree\Auth\TwoFactorAuthException;
+use Symfony\Contracts\HttpClient\Exception\ClientExceptionInterface;
+use Symfony\Contracts\HttpClient\Exception\RedirectionExceptionInterface;
+use Symfony\Contracts\HttpClient\Exception\ServerExceptionInterface;
+use Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface;
 
 /**
  * Class TwoFactorAuth
@@ -55,6 +61,10 @@ public function createSecret($bits = 160)
      */
     public function verifyCode($secret, $code)
     {
+        if (!$secret || !$code) {
+            return false;
+        }
+
         $secret = str_replace(' ', '', $secret);
 
         return $this->twoFa->verifyCode($secret, $code);
@@ -73,4 +83,36 @@ public function getQrImageData($username, $secret)
 
         return $this->twoFa->getQRCodeImageAsDataUri($label, $secret);
     }
+
+    /**
+     * @param string $yubikey_id
+     * @param string $otp
+     * @return bool
+     */
+    public function verifyYubikeyOTP(string $yubikey_id, string $otp): bool
+    {
+        // Quick sanity check
+        if (!$yubikey_id || !$otp || !Utils::startsWith($otp, $yubikey_id)) {
+            return false;
+        }
+
+        $api_url = "https://api.yubico.com/wsapi/2.0/verify?id=1&otp=%s&nonce=%s";
+        $client = Client::getClient();
+
+        $url = sprintf($api_url, $otp, Utils::getNonce('yubikey'));
+
+        try {
+            $response = $client->request('GET', $url);
+            if ($response->getStatusCode() === 200) {
+                $content = $response->getContent();
+                if (Utils::contains($content, 'status=OK')) {
+                    return true;
+                }
+            }
+        } catch (TransportExceptionInterface|ClientExceptionInterface|RedirectionExceptionInterface|ServerExceptionInterface $e) {
+            return false;
+        }
+
+        return false;
+    }
 }