diff --git a/entity_type_class.info.yml b/entity_type_class.info.yml
index 7e397c0..43b7380 100644
--- a/entity_type_class.info.yml
+++ b/entity_type_class.info.yml
@@ -1,4 +1,5 @@
 name: Entity Type Class
 type: module
 description: Provides a plugin based system to alter entity type classes.
-core: 8.x
\ No newline at end of file
+core: 8.x
+core_version_requirement: ^8 || ^9
\ No newline at end of file