diff --git a/composer.json b/composer.json
index 7c00b6d..8b319f1 100644
--- a/composer.json
+++ b/composer.json
@@ -2,7 +2,8 @@
   "name": "mageplaza/module-better-popup",
   "description": "Magento 2 Better Popup",
   "require": {
-    "mageplaza/module-core": "^1.4.5"
+    "mageplaza/module-core": "^1.4.5",
+    "mageplaza/module-smtp": "^4.5.3"
   },
   "type": "magento2-module",
   "version": "4.1.1",