diff --git a/packages/design-system/src/components/Dropdown/Dropdown.tsx b/packages/design-system/src/components/Dropdown/Dropdown.tsx
index 431cbbfe6a5..a05ca6262e4 100644
--- a/packages/design-system/src/components/Dropdown/Dropdown.tsx
+++ b/packages/design-system/src/components/Dropdown/Dropdown.tsx
@@ -87,6 +87,7 @@ export const Dropdown = ({
 				'aria-pressed': `${isOpen}`,
 				'data-testid': menuButtonTestId,
 				'data-test': menuButtonTest,
+				'aria-expanded': `${isOpen}`,
 				ref: floating.refs.setReference,
 				...getReferenceProps(),
 			})}