diff --git a/app/src/main/kotlin/com/zjutjh/ijh/ui/component/ClassSchedule.kt b/app/src/main/kotlin/com/zjutjh/ijh/ui/component/ClassSchedule.kt
index c517468..c1a6114 100644
--- a/app/src/main/kotlin/com/zjutjh/ijh/ui/component/ClassSchedule.kt
+++ b/app/src/main/kotlin/com/zjutjh/ijh/ui/component/ClassSchedule.kt
@@ -120,7 +120,6 @@ fun ClassSchedule(
                 startPadding = 30.dp,
             ) {
                 val today = dateTime.dayOfWeek
-
                 DayOfWeek.entries.forEachIndexed { index, dayOfWeek ->
                     val dayCourses = remember(courses) {
                         courses.filter { it.dayOfWeek == dayOfWeek }.toImmutableList()
@@ -134,6 +133,7 @@ fun ClassSchedule(
                 }
             }
 
+
             // Left section bar
             Surface(
                 modifier = Modifier
diff --git a/app/src/main/kotlin/com/zjutjh/ijh/ui/screen/ClassScheduleScreen.kt b/app/src/main/kotlin/com/zjutjh/ijh/ui/screen/ClassScheduleScreen.kt
index 1828d20..d60fdb8 100644
--- a/app/src/main/kotlin/com/zjutjh/ijh/ui/screen/ClassScheduleScreen.kt
+++ b/app/src/main/kotlin/com/zjutjh/ijh/ui/screen/ClassScheduleScreen.kt
@@ -152,11 +152,14 @@ private fun ClassScheduleScreen(
                 .verticalScroll(rememberScrollState()),
         ) {
             Box(contentAlignment = Alignment.TopCenter) {
-                ClassSchedule(
-                    modifier = Modifier.padding(10.dp),
-                    courses = courses,
-                    highlight = highlight,
-                )
+                // Force recompose when courses changed
+                key(courses) {
+                    ClassSchedule(
+                        modifier = Modifier.padding(10.dp),
+                        courses = courses,
+                        highlight = highlight,
+                    )
+                }
                 key(refreshing) {
                     PullRefreshIndicator(
                         refreshing = refreshing,
diff --git a/app/src/main/kotlin/com/zjutjh/ijh/widget/ScheduleWidgetReceiver.kt b/app/src/main/kotlin/com/zjutjh/ijh/widget/ScheduleWidgetReceiver.kt
index c4ed9f6..773c694 100644
--- a/app/src/main/kotlin/com/zjutjh/ijh/widget/ScheduleWidgetReceiver.kt
+++ b/app/src/main/kotlin/com/zjutjh/ijh/widget/ScheduleWidgetReceiver.kt
@@ -10,7 +10,6 @@ import androidx.work.WorkManager
 import com.zjutjh.ijh.data.repository.CourseRepository
 import com.zjutjh.ijh.data.repository.WeJhInfoRepository
 import com.zjutjh.ijh.work.ScheduleWidgetUpdater
-import com.zjutjh.ijh.work.WidgetRefreshWorker
 import dagger.hilt.EntryPoint
 import dagger.hilt.InstallIn
 import dagger.hilt.components.SingletonComponent
@@ -38,7 +37,7 @@ class ScheduleWidgetReceiver : GlanceAppWidgetReceiver() {
         val request = PeriodicWorkRequestBuilder<ScheduleWidgetUpdater>(
             Duration.ofHours(6), Duration.ofMinutes(30)
         ).setConstraints(
-            Constraints(requiresBatteryNotLow = true, requiresDeviceIdle = true)
+            Constraints(requiresBatteryNotLow = true)
         ).build()
 
         manager.enqueueUniquePeriodicWork(
@@ -47,8 +46,6 @@ class ScheduleWidgetReceiver : GlanceAppWidgetReceiver() {
             request
         )
 
-        WidgetRefreshWorker.enqueue<ScheduleWidget>(context)
-
         Log.i("ScheduleWidget", "Updater enqueued.")
     }
 
@@ -58,8 +55,6 @@ class ScheduleWidgetReceiver : GlanceAppWidgetReceiver() {
         val manager = WorkManager.getInstance(context)
         manager.cancelUniqueWork(ScheduleWidgetUpdater.PERIODIC_UNIQUE_NAME)
 
-        WidgetRefreshWorker.cancel<ScheduleWidget>(context)
-
         Log.i("ScheduleWidget", "Updater canceled.")
     }
 }
diff --git a/app/src/main/kotlin/com/zjutjh/ijh/work/ScheduleWidgetUpdater.kt b/app/src/main/kotlin/com/zjutjh/ijh/work/ScheduleWidgetUpdater.kt
index b56d94e..a4dc95a 100644
--- a/app/src/main/kotlin/com/zjutjh/ijh/work/ScheduleWidgetUpdater.kt
+++ b/app/src/main/kotlin/com/zjutjh/ijh/work/ScheduleWidgetUpdater.kt
@@ -48,6 +48,7 @@ class ScheduleWidgetUpdater(
             val info = entryPoint.weJhInfoRepository.sync()
             entryPoint.courseRepository.sync(info.first, info.second)
 
+            Log.i("ScheduleWidget", "Synced.")
             Result.success()
         } catch (e: ApiResponseException) {
             // Not logged in, stop the worker
@@ -59,13 +60,13 @@ class ScheduleWidgetUpdater(
                 }
 
                 else -> {
-                    Log.e("ScheduleWidget", "Failed to sync: $e")
+                    Log.e("ScheduleWidget", "Failed to sync.", e)
                 }
             }
 
             Result.failure()
         } catch (e: Exception) {
-            Log.e("ScheduleWidget", "Failed to sync: $e")
+            Log.e("ScheduleWidget", "Failed to sync", e)
 
             Result.failure()
         }
diff --git a/app/src/main/kotlin/com/zjutjh/ijh/work/WidgetRefreshWorker.kt b/app/src/main/kotlin/com/zjutjh/ijh/work/WidgetRefreshWorker.kt
index 761600d..a2011ae 100644
--- a/app/src/main/kotlin/com/zjutjh/ijh/work/WidgetRefreshWorker.kt
+++ b/app/src/main/kotlin/com/zjutjh/ijh/work/WidgetRefreshWorker.kt
@@ -30,17 +30,18 @@ class WidgetRefreshWorker(
         /**
          * Enqueue a [WidgetRefreshWorker] for the given [GlanceAppWidget].
          * Do nothing if the worker is already enqueued.
-         * Default refresh interval is 20 minutes.
+         * Default refresh interval is 15 minutes.
          */
         inline fun <reified T : GlanceAppWidget> enqueue(context: Context) {
             val manager = WorkManager.getInstance(context)
             val request = PeriodicWorkRequestBuilder<WidgetRefreshWorker>(
-                Duration.ofMinutes(20), Duration.ofMinutes(5)
+                Duration.ofMinutes(15), Duration.ofMinutes(5)
             ).setConstraints(
-                Constraints(requiresBatteryNotLow = true, requiresDeviceIdle = true)
+                Constraints(requiresBatteryNotLow = true)
             ).setInputData(
                 workDataOf(INPUT_CLASS_NAME to T::class.java.name)
-            ).build()
+            )
+                .build()
 
             manager.enqueueUniquePeriodicWork(
                 getUniqueWorkName<T>(),
@@ -70,6 +71,7 @@ class WidgetRefreshWorker(
 
             obj.updateAll(context)
 
+            Log.i("WidgetRefreshWorker", "Widget refreshed: $className")
             Result.success()
         } catch (e: Exception) {
             Log.e("WidgetRefreshWorker", "Error when refreshing widget.", e)
diff --git a/app/src/main/res/xml/app_widget_schedule.xml b/app/src/main/res/xml/app_widget_schedule.xml
index 1e87da7..51191a0 100644
--- a/app/src/main/res/xml/app_widget_schedule.xml
+++ b/app/src/main/res/xml/app_widget_schedule.xml
@@ -12,6 +12,6 @@
     android:resizeMode="horizontal|vertical"
     android:targetCellWidth="3"
     android:targetCellHeight="3"
-    android:updatePeriodMillis="0"
+    android:updatePeriodMillis="1800000"
     android:widgetCategory="home_screen"
     tools:targetApi="s" />
\ No newline at end of file