diff --git a/config/services.php b/config/services.php
index 2a1d616c..0ace530e 100644
--- a/config/services.php
+++ b/config/services.php
@@ -18,6 +18,7 @@ return [
         'domain' => env('MAILGUN_DOMAIN'),
         'secret' => env('MAILGUN_SECRET'),
         'endpoint' => env('MAILGUN_ENDPOINT', 'api.mailgun.net'),
+        'scheme' => 'https',
     ],
 
     'postmark' => [