diff --git a/null_user.info.yml b/null_user.info.yml
index 430b27b..cda38df 100644
--- a/null_user.info.yml
+++ b/null_user.info.yml
@@ -2,3 +2,4 @@ name: Null User
 description: Adds a NullUser class for easier object comparison.
 type: module
 core: 8.x
+core_version_requirement: ^8 || ^9