diff --git a/composer.json b/composer.json
index 1205074..14e8d81 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,8 @@
   },
   "license": "GPL-2.0+",
   "require": {
-    "drupal/config_filter": "*"
+    "drupal/config_filter": "*",
+    "drupal/core": "^8.8||^9"
   },
   "conflict": {
     "drupal/console": "<1.3.2"
diff --git a/config_split.info.yml b/config_split.info.yml
index 03b5d25..dad483c 100644
--- a/config_split.info.yml
+++ b/config_split.info.yml
@@ -1,7 +1,7 @@
 name: Configuration Split
 type: module
 description: Configuration filter for importing and exporting split config
-core: 8.x
+core_version_requirement: ^8.8 || ^9
 package: Config
 configure: entity.config_split.collection
 dependencies: