diff --git a/.travis.yml b/.travis.yml
index 1c1038b8..eadf43fc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,7 +14,7 @@ cache:
 branches:
   only:
     - develop
-    - 0.20.3
+    - 0.20.4
 
 android:
  licenses:
diff --git a/app/build.gradle b/app/build.gradle
index 2d608f97..d9936480 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -18,8 +18,8 @@ android {
         testApplicationId "io.github.tests.wulkanowy"
         minSdkVersion 17
         targetSdkVersion 29
-        versionCode 67
-        versionName "0.20.3"
+        versionCode 68
+        versionName "0.20.4"
         multiDexEnabled true
         resValue "string", "app_name", "Wulkanowy"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
@@ -126,7 +126,7 @@ configurations.all {
 }
 
 dependencies {
-    implementation "io.github.wulkanowy:sdk:0.20.3"
+    implementation "io.github.wulkanowy:sdk:0.20.4"
 
     coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.0.10'
 
@@ -147,7 +147,7 @@ dependencies {
     implementation "androidx.swiperefreshlayout:swiperefreshlayout:1.1.0"
     implementation "androidx.constraintlayout:constraintlayout:2.0.1"
     implementation "androidx.coordinatorlayout:coordinatorlayout:1.1.0"
-    implementation "com.google.android.material:material:1.2.0"
+    implementation "com.google.android.material:material:1.2.1"
     implementation "com.github.wulkanowy:material-chips-input:2.1.1"
     implementation "com.github.PhilJay:MPAndroidChart:v3.1.0"
     implementation "me.zhanghai.android.materialprogressbar:library:1.6.1"
@@ -176,7 +176,7 @@ dependencies {
     implementation "fr.bipi.treessence:treessence:0.3.2"
     implementation "com.mikepenz:aboutlibraries-core:$about_libraries"
     implementation 'com.wdullaer:materialdatetimepicker:4.2.3'
-    implementation "io.coil-kt:coil:1.0.0-rc1"
+    implementation "io.coil-kt:coil:1.0.0-rc2"
     implementation "io.github.wulkanowy:AppKillerManager:3.0.0"
     implementation 'me.xdrop:fuzzywuzzy:1.3.1'
 
diff --git a/app/src/main/java/io/github/wulkanowy/data/Resource.kt b/app/src/main/java/io/github/wulkanowy/data/Resource.kt
index ae22832a..406440c8 100644
--- a/app/src/main/java/io/github/wulkanowy/data/Resource.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/Resource.kt
@@ -1,6 +1,6 @@
 package io.github.wulkanowy.data
 
-data class Resource<out T>(val status: Status, val data: T?, val error: Throwable?) {
+data class Resource<T>(val status: Status, val data: T?, val error: Throwable?) {
     companion object {
         fun <T> success(data: T?): Resource<T> {
             return Resource(Status.SUCCESS, data, null)
diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/exam/ExamRepository.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/exam/ExamRepository.kt
index e7f115ac..3f4591a2 100644
--- a/app/src/main/java/io/github/wulkanowy/data/repositories/exam/ExamRepository.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/exam/ExamRepository.kt
@@ -2,9 +2,9 @@ package io.github.wulkanowy.data.repositories.exam
 
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
-import io.github.wulkanowy.utils.monday
+import io.github.wulkanowy.utils.endExamsDay
 import io.github.wulkanowy.utils.networkBoundResource
-import io.github.wulkanowy.utils.sunday
+import io.github.wulkanowy.utils.startExamsDay
 import io.github.wulkanowy.utils.uniqueSubtract
 import java.time.LocalDate
 import javax.inject.Inject
@@ -18,8 +18,8 @@ class ExamRepository @Inject constructor(
 
     fun getExams(student: Student, semester: Semester, start: LocalDate, end: LocalDate, forceRefresh: Boolean) = networkBoundResource(
         shouldFetch = { it.isEmpty() || forceRefresh },
-        query = { local.getExams(semester, start.monday, end.sunday) },
-        fetch = { remote.getExams(student, semester, start.monday, end.sunday) },
+        query = { local.getExams(semester, start.startExamsDay, start.endExamsDay) },
+        fetch = { remote.getExams(student, semester, start.startExamsDay, start.endExamsDay) },
         saveFetchResult = { old, new ->
             local.deleteExams(old uniqueSubtract new)
             local.saveExams(new uniqueSubtract old)
diff --git a/app/src/main/java/io/github/wulkanowy/data/repositories/semester/SemesterRepository.kt b/app/src/main/java/io/github/wulkanowy/data/repositories/semester/SemesterRepository.kt
index 7a76503f..2748f1df 100644
--- a/app/src/main/java/io/github/wulkanowy/data/repositories/semester/SemesterRepository.kt
+++ b/app/src/main/java/io/github/wulkanowy/data/repositories/semester/SemesterRepository.kt
@@ -8,6 +8,7 @@ import io.github.wulkanowy.utils.getCurrentOrLast
 import io.github.wulkanowy.utils.isCurrent
 import io.github.wulkanowy.utils.uniqueSubtract
 import kotlinx.coroutines.withContext
+import timber.log.Timber
 import javax.inject.Inject
 import javax.inject.Singleton
 
@@ -41,7 +42,7 @@ class SemesterRepository @Inject constructor(
 
     private suspend fun refreshSemesters(student: Student) {
         val new = remote.getSemesters(student)
-        if (new.isEmpty()) throw IllegalArgumentException("Empty semester list!")
+        if (new.isEmpty()) return Timber.i("Empty semester list!")
 
         val old = local.getSemesters(student)
         local.deleteSemesters(old.uniqueSubtract(new))
diff --git a/app/src/main/java/io/github/wulkanowy/services/alarm/TimetableNotificationSchedulerHelper.kt b/app/src/main/java/io/github/wulkanowy/services/alarm/TimetableNotificationSchedulerHelper.kt
index 8f8782a2..5c4b916b 100644
--- a/app/src/main/java/io/github/wulkanowy/services/alarm/TimetableNotificationSchedulerHelper.kt
+++ b/app/src/main/java/io/github/wulkanowy/services/alarm/TimetableNotificationSchedulerHelper.kt
@@ -26,7 +26,9 @@ import io.github.wulkanowy.services.alarm.TimetableNotificationReceiver.Companio
 import io.github.wulkanowy.services.alarm.TimetableNotificationReceiver.Companion.STUDENT_ID
 import io.github.wulkanowy.services.alarm.TimetableNotificationReceiver.Companion.STUDENT_NAME
 import io.github.wulkanowy.ui.modules.main.MainView
+import io.github.wulkanowy.utils.DispatchersProvider
 import io.github.wulkanowy.utils.toTimestamp
+import kotlinx.coroutines.withContext
 import timber.log.Timber
 import java.time.LocalDateTime
 import java.time.LocalDateTime.now
@@ -35,7 +37,8 @@ import javax.inject.Inject
 class TimetableNotificationSchedulerHelper @Inject constructor(
     @ApplicationContext private val context: Context,
     private val alarmManager: AlarmManager,
-    private val preferencesRepository: PreferencesRepository
+    private val preferencesRepository: PreferencesRepository,
+    private val dispatchersProvider: DispatchersProvider,
 ) {
 
     private fun getRequestCode(time: LocalDateTime, studentId: Int) = (time.toTimestamp() * studentId).toInt()
@@ -44,13 +47,15 @@ class TimetableNotificationSchedulerHelper @Inject constructor(
         return day.getOrNull(index - 1)?.end ?: lesson.start.minusMinutes(30)
     }
 
-    fun cancelScheduled(lessons: List<Timetable>, studentId: Int = 1) {
-        lessons.sortedBy { it.start }.forEachIndexed { index, lesson ->
-            val upcomingTime = getUpcomingLessonTime(index, lessons, lesson)
-            cancelScheduledTo(upcomingTime..lesson.start, getRequestCode(upcomingTime, studentId))
-            cancelScheduledTo(lesson.start..lesson.end, getRequestCode(lesson.start, studentId))
+    suspend fun cancelScheduled(lessons: List<Timetable>, studentId: Int = 1) {
+        withContext(dispatchersProvider.backgroundThread) {
+            lessons.sortedBy { it.start }.forEachIndexed { index, lesson ->
+                val upcomingTime = getUpcomingLessonTime(index, lessons, lesson)
+                cancelScheduledTo(upcomingTime..lesson.start, getRequestCode(upcomingTime, studentId))
+                cancelScheduledTo(lesson.start..lesson.end, getRequestCode(lesson.start, studentId))
 
-            Timber.d("TimetableNotification canceled: type 1 & 2, subject: ${lesson.subject}, start: ${lesson.start}, student: $studentId")
+                Timber.d("TimetableNotification canceled: type 1 & 2, subject: ${lesson.subject}, start: ${lesson.start}, student: $studentId")
+            }
         }
     }
 
@@ -61,28 +66,30 @@ class TimetableNotificationSchedulerHelper @Inject constructor(
 
     fun cancelNotification() = NotificationManagerCompat.from(context).cancel(MainView.Section.TIMETABLE.id)
 
-    fun scheduleNotifications(lessons: List<Timetable>, student: Student) {
+    suspend fun scheduleNotifications(lessons: List<Timetable>, student: Student) {
         if (!preferencesRepository.isUpcomingLessonsNotificationsEnable) return cancelScheduled(lessons, student.studentId)
 
-        lessons.groupBy { it.date }
-            .map { it.value.sortedBy { lesson -> lesson.start } }
-            .map { it.filter { lesson -> !lesson.canceled && lesson.isStudentPlan } }
-            .map { day ->
-                day.forEachIndexed { index, lesson ->
-                    val intent = createIntent(student, lesson, day.getOrNull(index + 1))
+        withContext(dispatchersProvider.backgroundThread) {
+            lessons.groupBy { it.date }
+                .map { it.value.sortedBy { lesson -> lesson.start } }
+                .map { it.filter { lesson -> !lesson.canceled && lesson.isStudentPlan } }
+                .map { day ->
+                    day.forEachIndexed { index, lesson ->
+                        val intent = createIntent(student, lesson, day.getOrNull(index + 1))
 
-                    if (lesson.start > now()) {
-                        scheduleBroadcast(intent, student.studentId, NOTIFICATION_TYPE_UPCOMING, getUpcomingLessonTime(index, day, lesson))
-                    }
+                        if (lesson.start > now()) {
+                            scheduleBroadcast(intent, student.studentId, NOTIFICATION_TYPE_UPCOMING, getUpcomingLessonTime(index, day, lesson))
+                        }
 
-                    if (lesson.end > now()) {
-                        scheduleBroadcast(intent, student.studentId, NOTIFICATION_TYPE_CURRENT, lesson.start)
-                        if (day.lastIndex == index) {
-                            scheduleBroadcast(intent, student.studentId, NOTIFICATION_TYPE_LAST_LESSON_CANCELLATION, lesson.end)
+                        if (lesson.end > now()) {
+                            scheduleBroadcast(intent, student.studentId, NOTIFICATION_TYPE_CURRENT, lesson.start)
+                            if (day.lastIndex == index) {
+                                scheduleBroadcast(intent, student.studentId, NOTIFICATION_TYPE_LAST_LESSON_CANCELLATION, lesson.end)
+                            }
                         }
                     }
                 }
-            }
+        }
     }
 
     private fun createIntent(student: Student, lesson: Timetable, nextLesson: Timetable?): Intent {
diff --git a/app/src/main/java/io/github/wulkanowy/services/sync/SyncManager.kt b/app/src/main/java/io/github/wulkanowy/services/sync/SyncManager.kt
index 1d005ae8..47a94927 100644
--- a/app/src/main/java/io/github/wulkanowy/services/sync/SyncManager.kt
+++ b/app/src/main/java/io/github/wulkanowy/services/sync/SyncManager.kt
@@ -44,6 +44,7 @@ class SyncManager @Inject constructor(
 
         if (SDK_INT >= O) {
             channels.forEach { it.create() }
+            notificationManager.deleteNotificationChannel("lesson_channel")
             notificationManager.deleteNotificationChannel("new_entries_channel")
         }
 
diff --git a/app/src/main/java/io/github/wulkanowy/services/sync/channels/UpcomingLessonsChannel.kt b/app/src/main/java/io/github/wulkanowy/services/sync/channels/UpcomingLessonsChannel.kt
index 41fb6192..63b3a4f9 100644
--- a/app/src/main/java/io/github/wulkanowy/services/sync/channels/UpcomingLessonsChannel.kt
+++ b/app/src/main/java/io/github/wulkanowy/services/sync/channels/UpcomingLessonsChannel.kt
@@ -17,7 +17,7 @@ class UpcomingLessonsChannel @Inject constructor(
 ) : Channel {
 
     companion object {
-        const val CHANNEL_ID = "lesson_channel"
+        const val CHANNEL_ID = "upcoming_lesson_channel"
     }
 
     override fun create() {
diff --git a/app/src/main/java/io/github/wulkanowy/services/sync/works/ExamWork.kt b/app/src/main/java/io/github/wulkanowy/services/sync/works/ExamWork.kt
index f7d8db0a..899d45cb 100644
--- a/app/src/main/java/io/github/wulkanowy/services/sync/works/ExamWork.kt
+++ b/app/src/main/java/io/github/wulkanowy/services/sync/works/ExamWork.kt
@@ -3,8 +3,6 @@ package io.github.wulkanowy.services.sync.works
 import io.github.wulkanowy.data.db.entities.Semester
 import io.github.wulkanowy.data.db.entities.Student
 import io.github.wulkanowy.data.repositories.exam.ExamRepository
-import io.github.wulkanowy.utils.monday
-import io.github.wulkanowy.utils.sunday
 import io.github.wulkanowy.utils.waitForResult
 import java.time.LocalDate.now
 import javax.inject.Inject
@@ -12,6 +10,6 @@ import javax.inject.Inject
 class ExamWork @Inject constructor(private val examRepository: ExamRepository) : Work {
 
     override suspend fun doWork(student: Student, semester: Semester) {
-        examRepository.getExams(student, semester, now().monday, now().sunday, true).waitForResult()
+        examRepository.getExams(student, semester, now(), now(), true).waitForResult()
     }
 }
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/statistics/GradeStatisticsPresenter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/statistics/GradeStatisticsPresenter.kt
index 112f4c58..73cee9e9 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/grade/statistics/GradeStatisticsPresenter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/grade/statistics/GradeStatisticsPresenter.kt
@@ -164,8 +164,8 @@ class GradeStatisticsPresenter @Inject constructor(
                 Status.SUCCESS -> {
                     Timber.i("Loading grade stats result: Success")
                     view?.run {
-                        showEmpty(it.data!!.isEmpty())
-                        showContent(it.data.isNotEmpty())
+                        showEmpty(it.data!!.isEmpty() || it.data.first().partial.isEmpty())
+                        showContent(it.data.isNotEmpty() && it.data.first().partial.isNotEmpty())
                         showErrorView(false)
                         updateData(it.data, preferencesRepository.gradeColorTheme, preferencesRepository.showAllSubjectsOnStatisticsList)
                         showSubjects(!preferencesRepository.showAllSubjectsOnStatisticsList)
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetableAdapter.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetableAdapter.kt
index d87f0620..58be38ce 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetableAdapter.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetableAdapter.kt
@@ -6,6 +6,7 @@ import android.view.View.GONE
 import android.view.View.VISIBLE
 import android.view.ViewGroup
 import android.widget.TextView
+import androidx.core.view.ViewCompat
 import androidx.recyclerview.widget.RecyclerView
 import io.github.wulkanowy.R
 import io.github.wulkanowy.data.db.entities.Timetable
@@ -44,8 +45,8 @@ class TimetableAdapter @Inject constructor() : RecyclerView.Adapter<RecyclerView
 
     private val timers = mutableMapOf<Int, Timer>()
 
-    private fun resetTimers() {
-        Timber.d("Timetable timers reset")
+    fun resetTimers() {
+        Timber.d("Timetable timers (${timers.size}) reset")
         with(timers) {
             forEach { (_, timer) -> timer.cancel() }
             clear()
@@ -69,11 +70,6 @@ class TimetableAdapter @Inject constructor() : RecyclerView.Adapter<RecyclerView
         }
     }
 
-    override fun onDetachedFromRecyclerView(recyclerView: RecyclerView) {
-        super.onDetachedFromRecyclerView(recyclerView)
-        resetTimers()
-    }
-
     override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
         val lesson = items[position]
 
@@ -112,8 +108,12 @@ class TimetableAdapter @Inject constructor() : RecyclerView.Adapter<RecyclerView
             bindNormalDescription(binding, lesson)
             bindNormalColors(binding, lesson)
 
-            if (lesson.isStudentPlan && showTimers) timers[position] = timer(period = 1000) {
-                root.post { updateTimeLeft(binding, lesson, position) }
+            if (lesson.isStudentPlan && showTimers) {
+                timers[position] = timer(period = 1000) {
+                    if (ViewCompat.isAttachedToWindow(root)) {
+                        root.post { updateTimeLeft(binding, lesson, position) }
+                    }
+                }
             } else {
                 // reset item on set changed
                 timetableItemTimeUntil.visibility = GONE
diff --git a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetableFragment.kt b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetableFragment.kt
index 2c5e136d..74a9aa6e 100644
--- a/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetableFragment.kt
+++ b/app/src/main/java/io/github/wulkanowy/ui/modules/timetable/TimetableFragment.kt
@@ -185,6 +185,7 @@ class TimetableFragment : BaseFragment<FragmentTimetableBinding>(R.layout.fragme
     }
 
     override fun onDestroyView() {
+        timetableAdapter.resetTimers()
         presenter.onDetachView()
         super.onDestroyView()
     }
diff --git a/app/src/main/java/io/github/wulkanowy/utils/AttendanceExtension.kt b/app/src/main/java/io/github/wulkanowy/utils/AttendanceExtension.kt
index 92e8661f..f10b00a0 100644
--- a/app/src/main/java/io/github/wulkanowy/utils/AttendanceExtension.kt
+++ b/app/src/main/java/io/github/wulkanowy/utils/AttendanceExtension.kt
@@ -27,7 +27,7 @@ private fun calculatePercentage(presence: Double, absence: Double): Double {
 }
 
 inline val Attendance.description
-    get() = when (AttendanceCategory.valueOf(name)) {
+    get() = when (AttendanceCategory.getCategoryByName(name)) {
         AttendanceCategory.PRESENCE -> R.string.attendance_present
         AttendanceCategory.ABSENCE_UNEXCUSED -> R.string.attendance_absence_unexcused
         AttendanceCategory.ABSENCE_EXCUSED -> R.string.attendance_absence_excused
diff --git a/app/src/main/java/io/github/wulkanowy/utils/FlowUtils.kt b/app/src/main/java/io/github/wulkanowy/utils/FlowUtils.kt
index 31499405..23b86dd3 100644
--- a/app/src/main/java/io/github/wulkanowy/utils/FlowUtils.kt
+++ b/app/src/main/java/io/github/wulkanowy/utils/FlowUtils.kt
@@ -89,7 +89,7 @@ fun <T> flowWithResourceIn(block: suspend () -> Flow<Resource<T>>) = flow {
                 }
             }
     } catch (e: Throwable) {
-        emit(Resource.error(e))
+        emit(Resource.error<T>(e))
     }
 }
 
diff --git a/app/src/main/java/io/github/wulkanowy/utils/TimeExtension.kt b/app/src/main/java/io/github/wulkanowy/utils/TimeExtension.kt
index d1aba160..9bd30e87 100644
--- a/app/src/main/java/io/github/wulkanowy/utils/TimeExtension.kt
+++ b/app/src/main/java/io/github/wulkanowy/utils/TimeExtension.kt
@@ -13,8 +13,7 @@ import java.time.Month
 import java.time.ZoneId
 import java.time.ZoneOffset
 import java.time.format.DateTimeFormatter.ofPattern
-import java.time.format.TextStyle.FULL_STANDALONE
-import java.time.format.TextStyle.*
+import java.time.format.TextStyle.FULL
 import java.time.temporal.TemporalAdjusters.firstInMonth
 import java.time.temporal.TemporalAdjusters.next
 import java.time.temporal.TemporalAdjusters.previous
@@ -78,6 +77,12 @@ inline val LocalDate.nextOrSameSchoolDay: LocalDate
         }
     }
 
+inline val LocalDate.startExamsDay: LocalDate
+    get() = nextOrSameSchoolDay.monday
+
+inline val LocalDate.endExamsDay: LocalDate
+    get() = nextOrSameSchoolDay.monday.plusWeeks(4).minusDays(1)
+
 inline val LocalDate.previousOrSameSchoolDay: LocalDate
     get() {
         return when (dayOfWeek) {
diff --git a/app/src/main/play/release-notes/pl-PL/default.txt b/app/src/main/play/release-notes/pl-PL/default.txt
index 47df9980..6ca04c57 100644
--- a/app/src/main/play/release-notes/pl-PL/default.txt
+++ b/app/src/main/play/release-notes/pl-PL/default.txt
@@ -1,4 +1,7 @@
-Wersja 0.20.3
-- naprawiliśmy opisy wpisów frekwencyjnych, które teraz będą już w całości po polsku
+Wersja 0.20.4
+- dodaliśmy obsługę koszalińskiego dziennika
+- poprawiliśmy synchronizację sprawdzianów
+- wyłączyliśmy dźwięk powiadomienia przy włączonej opcji pokazywania nadchodzących lekcji w powiadomieniu
+- poprawiliśmy problemy ze stabilnością we frekwencji i planie lekcji
 
 Pełna lista zmian: https://github.com/wulkanowy/wulkanowy/releases
diff --git a/app/src/main/res/values/api_hosts.xml b/app/src/main/res/values/api_hosts.xml
index 64618568..29434602 100644
--- a/app/src/main/res/values/api_hosts.xml
+++ b/app/src/main/res/values/api_hosts.xml
@@ -7,6 +7,7 @@
         <item>Lubelski Portal Oświatowy</item>
         <item>EduNet Miasta Tarnowa</item>
         <item>ResMan Rzeszów</item>
+        <item>Platforma Edukacyjna Koszalina</item>
         <item>Rawa Mazowiecka - Platforma vEdukacja</item>
         <item>Zduńska Wola - e-Urząd</item>
         <item>Sieradz - Portal oświatowy</item>
@@ -27,6 +28,7 @@
         <item>https://edu.lublin.eu</item>
         <item>https://umt.tarnow.pl</item>
         <item>https://resman.pl</item>
+        <item>https://eduportal.koszalin.pl</item>
         <item>https://vulcan.net.pl/</item>
         <item>https://vulcan.net.pl/</item>
         <item>https://vulcan.net.pl/</item>
@@ -47,6 +49,7 @@
         <item>lublin</item>
         <item>tarnow</item>
         <item>rzeszow</item>
+        <item>koszalin</item>
         <item>rawamazowiecka</item>
         <item>zdunskawola</item>
         <item>sieradz</item>
diff --git a/app/src/test/java/io/github/wulkanowy/utils/TimeExtensionTest.kt b/app/src/test/java/io/github/wulkanowy/utils/TimeExtensionTest.kt
index 9709ded3..d604dfef 100644
--- a/app/src/test/java/io/github/wulkanowy/utils/TimeExtensionTest.kt
+++ b/app/src/test/java/io/github/wulkanowy/utils/TimeExtensionTest.kt
@@ -171,4 +171,42 @@ class TimeExtensionTest {
         assertEquals(of(2019, 5, 1), of(2019, 5, 1).getLastSchoolDayIfHoliday(2018))
         assertEquals(of(2018, 5, 1), of(2019, 5, 1).getLastSchoolDayIfHoliday(2017))
     }
+
+    @Test
+    fun getExamsCutOffDates() {
+        with(of(2020, 9, 13)) {
+            assertEquals(of(2020, 9, 14), startExamsDay)
+            assertEquals(of(2020, 10, 11), endExamsDay)
+        }
+
+        with(of(2020, 9, 14)) {
+            assertEquals(of(2020, 9, 14), startExamsDay)
+            assertEquals(of(2020, 10, 11), endExamsDay)
+        }
+
+        with(of(2020, 9, 15)) {
+            assertEquals(of(2020, 9, 14), startExamsDay)
+            assertEquals(of(2020, 10, 11), endExamsDay)
+        }
+
+        with(of(2020, 9, 16)) {
+            assertEquals(of(2020, 9, 14), startExamsDay)
+            assertEquals(of(2020, 10, 11), endExamsDay)
+        }
+
+        with(of(2020, 9, 17)) {
+            assertEquals(of(2020, 9, 14), startExamsDay)
+            assertEquals(of(2020, 10, 11), endExamsDay)
+        }
+
+        with(of(2020, 9, 18)) {
+            assertEquals(of(2020, 9, 14), startExamsDay)
+            assertEquals(of(2020, 10, 11), endExamsDay)
+        }
+
+        with(of(2020, 9, 19)) {
+            assertEquals(of(2020, 9, 21), startExamsDay)
+            assertEquals(of(2020, 10, 18), endExamsDay)
+        }
+    }
 }
diff --git a/build.gradle b/build.gradle
index 9f239fdd..4205cce5 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,8 +1,8 @@
 buildscript {
     ext {
-        kotlin_version = '1.4.0'
+        kotlin_version = '1.4.10'
         about_libraries = '8.3.0'
-        hilt_version = "2.28.3-alpha"
+        hilt_version = "2.29.1-alpha"
     }
     repositories {
         mavenCentral()
@@ -15,7 +15,7 @@ buildscript {
         classpath 'com.android.tools.build:gradle:4.0.1'
         classpath "com.google.dagger:hilt-android-gradle-plugin:$hilt_version"
         classpath 'com.google.gms:google-services:4.3.3'
-        classpath 'com.google.firebase:firebase-crashlytics-gradle:2.2.1'
+        classpath 'com.google.firebase:firebase-crashlytics-gradle:2.3.0'
         classpath "com.github.triplet.gradle:play-publisher:2.7.5"
         classpath "org.sonarsource.scanner.gradle:sonarqube-gradle-plugin:3.0"
         classpath "gradle.plugin.com.star-zero.gradle:githook:1.2.0"