diff --git a/htmlpurifier.info.yml b/htmlpurifier.info.yml
index 75de4bc..532f917 100644
--- a/htmlpurifier.info.yml
+++ b/htmlpurifier.info.yml
@@ -3,3 +3,4 @@ type: module
 description: 'Filter that removes malicious HTML and ensures standards compliant output.'
 package: Filter
 core: 8.x
+core_version_requirement: ^8 || ^9