diff --git a/platform_design/lib/main.dart b/platform_design/lib/main.dart
index 1151bf8c1..f9aa8face 100644
--- a/platform_design/lib/main.dart
+++ b/platform_design/lib/main.dart
@@ -25,6 +25,7 @@ class MyAdaptingApp extends StatelessWidget {
       theme: ThemeData(
         // Use the green theme for Material widgets.
         primarySwatch: Colors.green,
+        useMaterial3: true,
       ),
       darkTheme: ThemeData.dark(),
       builder: (context, child) {