diff --git a/composer.json b/composer.json
index 37ecab8..c5f8c99 100644
--- a/composer.json
+++ b/composer.json
@@ -13,11 +13,10 @@
     }],
     "minimum-stability": "dev",
     "require": {
-        "silverstripe/cms": "*",
+        "silverstripe/cms": "^5",
         "a2nt/silverstripe-elemental-basics": "*",
         "silverstripe/widgets": "*",
-        "gorriecoe/silverstripe-linkfield": "*",
-        "symfony/mailer": "^6"
+        "gorriecoe/silverstripe-linkfield": "*"
     },
     "autoload": {
         "psr-4": {