diff --git a/refilc/android/app/src/main/java/hu/refilc/naplo/widget_timetable/WidgetTimetableDataProvider.java b/refilc/android/app/src/main/java/hu/refilc/naplo/widget_timetable/WidgetTimetableDataProvider.java
index e62f675..4e68c21 100644
--- a/refilc/android/app/src/main/java/hu/refilc/naplo/widget_timetable/WidgetTimetableDataProvider.java
+++ b/refilc/android/app/src/main/java/hu/refilc/naplo/widget_timetable/WidgetTimetableDataProvider.java
@@ -248,6 +248,9 @@ public class WidgetTimetableDataProvider implements RemoteViewsService.RemoteVie
     }
 
     private void initData() {
+        // refresh theme
+        fullTheme = getFullTheme(context);
+
         rday = WidgetTimetable.selectDay(context, appWidgetId, 0, false);
 
         day_subjects.clear();
diff --git a/refilc/lib/theme/observer.dart b/refilc/lib/theme/observer.dart
index e5baaec..c8824a6 100644
--- a/refilc/lib/theme/observer.dart
+++ b/refilc/lib/theme/observer.dart
@@ -1,4 +1,20 @@
+import 'dart:io';
+
 import 'package:flutter/material.dart';
+import 'package:home_widget/home_widget.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+
+Future<bool?> updateWidget() async {
+  try {
+    return HomeWidget.updateWidget(name: 'widget_timetable.WidgetTimetable');
+  } on PlatformException catch (exception) {
+    if (kDebugMode) {
+      print('Error Updating Widget After changeTheme. $exception');
+    }
+  }
+  return false;
+}
 
 class ThemeModeObserver extends ChangeNotifier {
   ThemeMode _themeMode;
@@ -13,6 +29,7 @@ class ThemeModeObserver extends ChangeNotifier {
   void changeTheme(ThemeMode mode, {bool updateNavbarColor = true}) {
     _themeMode = mode;
     _updateNavbarColor = updateNavbarColor;
+    if (Platform.isAndroid) updateWidget();
     notifyListeners();
   }
 }