diff --git a/.changeset/clever-bears-smile.md b/.changeset/clever-bears-smile.md
new file mode 100644
index 00000000000..768fff75c24
--- /dev/null
+++ b/.changeset/clever-bears-smile.md
@@ -0,0 +1,9 @@
+---
+'@growi/core': minor
+---
+
+- `Ref<T>` is modified
+    - includes ObjectId
+- `isPopulated()` is updated
+- `getIdForRef()` is updated
+- `getIdStringForRef()` is newly added