diff --git a/modules/theme/system_tags_theme.info.yml b/modules/theme/system_tags_theme.info.yml
index 332ab85..bf1f5fd 100644
--- a/modules/theme/system_tags_theme.info.yml
+++ b/modules/theme/system_tags_theme.info.yml
@@ -1,7 +1,7 @@
 name: System Tags Theme
 type: module
 description: 'Allows a themer to use specific templates based on System Tags.'
-core: 8.x
+core_version_requirement: ^8.8 || ^9
 
 dependencies:
   - system_tags:system_tags