diff --git a/.changeset/shy-birds-jump.md b/.changeset/shy-birds-jump.md
new file mode 100644
index 0000000000..d3f87e0ecb
--- /dev/null
+++ b/.changeset/shy-birds-jump.md
@@ -0,0 +1,5 @@
+---
+"@twilio-paste/combobox": patch
+---
+
+Changed type of MultiselectComboboxProps.onSelectedItemsChange.newSelectedItems to include type that is returned when not in IoC mode
diff --git a/packages/paste-core/components/combobox/src/types.ts b/packages/paste-core/components/combobox/src/types.ts
index feba49dd0f..5f54226b60 100644
--- a/packages/paste-core/components/combobox/src/types.ts
+++ b/packages/paste-core/components/combobox/src/types.ts
@@ -247,9 +247,12 @@ export interface MultiselectComboboxProps
   /**
    * Callback function for after an item is selected or deselected
    *
+   * If `state` prop is passed, `UseMultiSelectPrimitiveStateChange<Item>` is the type for the `newSelectedItems` callback param
+   *
+   * If `state` prop isn't passed, `any[]` is the type for the `newSelectedItems` callback param
    * @memberof MultiselectComboboxProps
    */
-  onSelectedItemsChange?: (newSelectedItems: UseMultiSelectPrimitiveStateChange<Item>) => void;
+  onSelectedItemsChange?: (newSelectedItems: any[] | UseMultiSelectPrimitiveStateChange<Item>) => void;
   /**
    * Hidden helper text for screen readers
    *