diff --git a/composer.json b/composer.json
index 0f2d276..d214334 100644
--- a/composer.json
+++ b/composer.json
@@ -19,6 +19,9 @@
         "oomphinc/composer-installers-extender": "^2.0",
         "sparksinteractive/sector-distribution": "^9.1"
     },
+    "require-dev": {
+        "drupal/core-dev": "^9.1"
+    },
     "config": {
         "sort-packages": true
     },