diff --git a/composer.json b/composer.json
index d17b90a..1c865ff 100644
--- a/composer.json
+++ b/composer.json
@@ -158,6 +158,7 @@
         "drupal/views_field_compare": "^1.0@beta",
         "drupal/viewsreference": "^1",
         "drupal/webform": "^6.0",
+        "drupal/webform_mailchimp": "^5.4",
         "drupal/weight": "^3.3",
         "drupal/workflow_buttons": "dev-8.x-1.x as 1.x-dev",
         "drush/drush": "^11",