diff --git a/pkgs/dartpad_ui/lib/main.dart b/pkgs/dartpad_ui/lib/main.dart
index a2b43a540..6cafad01f 100644
--- a/pkgs/dartpad_ui/lib/main.dart
+++ b/pkgs/dartpad_ui/lib/main.dart
@@ -531,7 +531,7 @@ class LoadingOverlay extends StatelessWidget {
         final color = theme.colorScheme.surface;
 
         return AnimatedContainer(
-          color: compiling ? color.withOpacity(0.8) : color.withOpacity(0.0),
+          color: color.withValues(alpha: compiling ? 0.8 : 0),
           duration: animationDelay,
           curve: animationCurve,
           child: compiling
diff --git a/pkgs/dartpad_ui/lib/widgets.dart b/pkgs/dartpad_ui/lib/widgets.dart
index 7100678cd..b3993d144 100644
--- a/pkgs/dartpad_ui/lib/widgets.dart
+++ b/pkgs/dartpad_ui/lib/widgets.dart
@@ -109,7 +109,7 @@ class RunButton extends StatelessWidget {
           backgroundColor: WidgetStateProperty.resolveWith(
             (states) {
               if (states.contains(WidgetState.disabled)) {
-                return runButtonColor.withOpacity(0.4);
+                return runButtonColor.withValues(alpha: 0.4);
               }
 
               return runButtonColor;