diff --git a/composer.json b/composer.json
index 1d6aeaf..cc54eee 100644
--- a/composer.json
+++ b/composer.json
@@ -19,6 +19,6 @@
   },
   "license": "GPL-2.0+",
   "require": {
-    "drupal/captcha": "^1.0.0-alpha1"
+    "drupal/captcha": "~8.0"
   }
 }
diff --git a/recaptcha.info.yml b/recaptcha.info.yml
index e4d224f..79af4e2 100644
--- a/recaptcha.info.yml
+++ b/recaptcha.info.yml
@@ -2,7 +2,13 @@ name: 'reCAPTCHA'
 type: module
 description: 'Protect your website from spam and abuse while letting real people pass through with ease.'
 package: Spam control
-core: 8.x
+# core: 8.x
 configure: recaptcha.admin_settings_form
 dependencies:
   - captcha
+
+# Information added by Drupal.org packaging script on 2016-07-30
+version: '8.x-2.2'
+core: '8.x'
+project: 'recaptcha'
+datestamp: 1469859566
diff --git a/recaptcha.module b/recaptcha.module
index 380854c..78dc16e 100644
--- a/recaptcha.module
+++ b/recaptcha.module
@@ -78,6 +78,8 @@ function recaptcha_captcha($op, $captcha_type = '') {
             $noscript = $renderer->render($recaptcha_widget_noscript);
           }
 
+          $invisible = $config->get('widget.size') == 'invisible';
+
           $attributes = [
             'class' => 'g-recaptcha',
             'data-sitekey' => $recaptcha_site_key,
@@ -86,6 +88,9 @@ function recaptcha_captcha($op, $captcha_type = '') {
             'data-size' => $config->get('widget.size'),
             'data-tabindex' => $config->get('widget.tabindex'),
           ];
+
+          if($invisible) $attributes['data-callback'] = 'onSubmit';
+
           // Filter out empty tabindex/size.
           $attributes = array_filter($attributes);
 
@@ -108,6 +113,7 @@ function recaptcha_captcha($op, $captcha_type = '') {
               ],
             ],
           ];
+          $captcha['form']['#attached']['library'][] = 'recaptcha/invisible-recaptcha';
         }
         else {
           // Fallback to Math captcha as reCAPTCHA is not configured.
diff --git a/src/Form/ReCaptchaAdminSettingsForm.php b/src/Form/ReCaptchaAdminSettingsForm.php
index fd2ca6d..e06f253 100644
--- a/src/Form/ReCaptchaAdminSettingsForm.php
+++ b/src/Form/ReCaptchaAdminSettingsForm.php
@@ -65,8 +65,8 @@ class ReCaptchaAdminSettingsForm extends ConfigFormBase {
       '#default_value' => $config->get('widget.theme'),
       '#description' => $this->t('Defines which theme to use for reCAPTCHA.'),
       '#options' => [
-        'light' => $this->t('Light (default)'),
-        'dark' => $this->t('Dark'),
+        'light' => t('Light (default)'),
+        'dark' => t('Dark'),
       ],
       '#title' => $this->t('Theme'),
       '#type' => 'select',
@@ -87,6 +87,7 @@ class ReCaptchaAdminSettingsForm extends ConfigFormBase {
       '#options' => [
         '' => $this->t('Normal (default)'),
         'compact' => $this->t('Compact'),
+        'invisible' => $this->t('Invisible'),
       ],
       '#title' => $this->t('Size'),
       '#type' => 'select',
diff --git a/src/ReCaptcha/RequestMethod/Drupal8Post.php b/src/ReCaptcha/RequestMethod/Drupal8Post.php
index 96a73b7..1c375ec 100644
--- a/src/ReCaptcha/RequestMethod/Drupal8Post.php
+++ b/src/ReCaptcha/RequestMethod/Drupal8Post.php
@@ -22,10 +22,10 @@ class Drupal8Post implements RequestMethod {
    * Submit the POST request with the specified parameters.
    *
    * @param RequestParameters $params
-   *   Request parameters.
+   *   Request parameters
    *
    * @return string
-   *   Body of the reCAPTCHA response.
+   *   Body of the reCAPTCHA response
    */
   public function submit(RequestParameters $params) {