diff --git a/packages/runtime-core/src/index.ts b/packages/runtime-core/src/index.ts
index c1066ac7..4ab1b396 100644
--- a/packages/runtime-core/src/index.ts
+++ b/packages/runtime-core/src/index.ts
@@ -126,7 +126,8 @@ export {
   WritableComputedRef,
   UnwrapRef,
   WritableComputedOptions,
-  ToRefs
+  ToRefs,
+  DeepReadonly
 } from '@vue/reactivity'
 export {
   // types