diff --git a/composer.json b/composer.json
index 2960cacc2..3b5ea5016 100644
--- a/composer.json
+++ b/composer.json
@@ -7,6 +7,7 @@
     "require": {
         "ext-curl": "*",
         "drupal/core": "^10.1.5",
+        "drupal/core-composer-scaffold": "^10.0",
         "drupal/admin_toolbar": "^3.0",
         "drupal/allowed_formats": "^2.0",
         "drupal/ckeditor": "^1.0",
@@ -64,9 +65,13 @@
         "league/uri": "^6.0",
         "php": "^8.1"
     },
+    "require-dev": {
+        "drupal/core-dev": "^10"
+    },
     "conflict": {
-        "drupal/core": "<10.2 || >10.2",
-        "drupal/core-dev": "<10.2 || >10.2",
+        "drupal/core": "<10.2 || >=10.3",
+        "drupal/core": "<10.2 || >=10.3",
+        "drupal/core-dev": "<10.2 || >=10.3",
         "drupal/ctools": "<3.11 || ^4.0.1",
         "drupal/gin_toolbar": ">1.0.0-rc5",
         "drupal/helfi_media_map": "*",