diff --git a/composer.json b/composer.json
index 016895b..878d511 100644
--- a/composer.json
+++ b/composer.json
@@ -18,9 +18,9 @@
       "email": "white@palantir.net"
     }
   ],
-  "minimum-stability": "dev",
+  "minimum-stability": "alpha",
   "require": {
-    "drush/drush": "^8.1.15 || ^9.0 || ^10.0 || ^11.0",
+    "drush/drush": ">=9",
     "phing/phing": "^3"
   },
   "replace": {