diff --git a/src/schedule-2.0/composer.json b/src/schedule-2.0/composer.json
index 6d855bb..81bd9ec 100644
--- a/src/schedule-2.0/composer.json
+++ b/src/schedule-2.0/composer.json
@@ -33,6 +33,7 @@
         "symfony/profiler-pack": "^1.0",
         "symfony/security-bundle": "4.4.*",
         "symfony/serializer-pack": "*",
+        "symfony/swiftmailer-bundle": "^3.4",
         "symfony/translation": "4.4.*",
         "symfony/twig-pack": "*",
         "symfony/validator": "4.4.*",