diff --git a/govcms8_uikit_starter.info.yml b/govcms8_uikit_starter.info.yml
index a8cec9d..8a413c5 100644
--- a/govcms8_uikit_starter.info.yml
+++ b/govcms8_uikit_starter.info.yml
@@ -2,6 +2,7 @@ name: 'GovCMS 8 UI-Kit Starter'
 description: 'Starter theme with basic implementation of GovCMS 8 UI-Kit. Cloning this theme is recommended, if you need more customization.'
 
 core: 8.x
+core_version_requirement: ^8 || ^9
 type: theme
 libraries:
   - govcms8_uikit_starter/global-styling