diff --git a/composer.json b/composer.json
index 1afaf125b..631ad32f5 100644
--- a/composer.json
+++ b/composer.json
@@ -36,8 +36,8 @@
     "vardot/varbase-updater": "2.x-dev"
   },
   "require-dev": {
-    "drupal/core-dev": "~10",
-    "drush/drush": "~12",
+    "drupal/core-dev": "~9",
+    "drush/drush": "~11 || ~12",
     "phpstan/phpstan": "~1.10.0",
     "phpstan/extension-installer": "~1.3.0",
     "mglaman/phpstan-drupal": "~1.1.0",