diff --git a/yg_property_one.info.yml b/yg_property_one.info.yml
index cb7582c..104bb55 100644
--- a/yg_property_one.info.yml
+++ b/yg_property_one.info.yml
@@ -1,6 +1,8 @@
 name: 'YG Property One'
 description: 'YG Property one is a Responsive Drupal 8 theme for Property related websites.'
 core: 8.x
+core_version_requirement: ^8 || ^9
+
 type: theme
 base theme: classy
 screenshot: yg_property_one.png