diff --git a/ontology.info.yml b/ontology.info.yml
index ed1a414..a7e01c1 100644
--- a/ontology.info.yml
+++ b/ontology.info.yml
@@ -2,6 +2,7 @@ name: Ontology
 type: module
 description: Publishes site structure as OWL ontology.
 core: 8.x
+core_version_requirement: ^8 || ^9
 package: Web services
 dependencies:
   - drupal:system (>=8.2)