diff --git a/lib/screens/siteConfig/ScanQRScreen.dart b/lib/screens/siteConfig/ScanQRScreen.dart
index fffcdf4..77342e1 100644
--- a/lib/screens/siteConfig/ScanQRScreen.dart
+++ b/lib/screens/siteConfig/ScanQRScreen.dart
@@ -93,7 +93,7 @@ class ScannerOverlay extends CustomPainter {
       );
 
     final backgroundPaint = Paint()
-      ..color = Colors.black.withOpacity(0.5)
+      ..color = Colors.black.withValues(alpha: 0.5)
       ..style = PaintingStyle.fill
       ..blendMode = BlendMode.srcOver;