diff --git a/packages/flutter_availability/lib/src/ui/widgets/calendar_grid.dart b/packages/flutter_availability/lib/src/ui/widgets/calendar_grid.dart
index 59d410c..2d10c7c 100644
--- a/packages/flutter_availability/lib/src/ui/widgets/calendar_grid.dart
+++ b/packages/flutter_availability/lib/src/ui/widgets/calendar_grid.dart
@@ -72,7 +72,7 @@ class CalendarGrid extends StatelessWidget {
         var day = dayNames[index ~/ 2];
         return Expanded(
           child: Text(
-            day,
+            day.toUpperCase(),
             style: textTheme.bodyLarge,
             textAlign: TextAlign.center,
           ),