diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index 526b4c2..bb80ebf 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -7,6 +7,7 @@
         <option name="testRunner" value="GRADLE" />
         <option name="distributionType" value="DEFAULT_WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="gradleJvm" value="Android Studio default JDK" />
         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$" />
diff --git a/.idea/jarRepositories.xml b/.idea/jarRepositories.xml
index eb2873e..1e2d92c 100644
--- a/.idea/jarRepositories.xml
+++ b/.idea/jarRepositories.xml
@@ -26,5 +26,10 @@
       <option name="name" value="Google" />
       <option name="url" value="https://dl.google.com/dl/android/maven2/" />
     </remote-repository>
+    <remote-repository>
+      <option name="id" value="MavenRepo" />
+      <option name="name" value="MavenRepo" />
+      <option name="url" value="https://repo.maven.apache.org/maven2/" />
+    </remote-repository>
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 6199cc2..ef61796 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
diff --git a/app/build.gradle b/app/build.gradle
index c989b8d..86e1d23 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -16,20 +16,21 @@ configurations.all {
 }
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion 32
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_8
-        targetCompatibility JavaVersion.VERSION_1_8
+        sourceCompatibility JavaVersion.VERSION_11
+        targetCompatibility JavaVersion.VERSION_11
     }
     kotlinOptions {
-        jvmTarget = "1.8"
+        jvmTarget = "11"
     }
     defaultConfig {
         applicationId "fr.forum_thalie.tsumugi"
         minSdkVersion 16
-        targetSdkVersion 30
-        versionCode 120
-        versionName "1.2.0"
+        targetSdkVersion 32
+        multiDexEnabled true
+        versionCode 121
+        versionName "1.2.1"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
     }
@@ -47,6 +48,9 @@ android {
 }
 
 dependencies {
+    def multidex_version = "2.0.1"
+    implementation "androidx.multidex:multidex:$multidex_version"
+
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     /*
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
@@ -67,15 +71,18 @@ dependencies {
 
      */
 
-    implementation "androidx.media:media:1.1.0"
+    implementation "androidx.media:media:1.5.0"
+
+    //noinspection GradleDependency
     implementation 'com.google.android.exoplayer:exoplayer:2.11.3'
+
     //implementation project(':exoplayer-library') // uses local ExoPlayer clone, from dev-v2 branch (fixes ISO-8859-1 ICY metadata
 
     implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
-    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.4.1'
 
-    implementation 'androidx.recyclerview:recyclerview:1.1.0'
-    implementation 'androidx.preference:preference:1.1.0'
+    implementation 'androidx.recyclerview:recyclerview:1.2.1'
+    implementation 'androidx.preference:preference-ktx:1.2.0'
 
     // jsoup HTML parser library @ https://jsoup.org/
     // implementation 'org.jsoup:jsoup:1.12.1'
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 61de311..79f8a02 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -10,7 +10,8 @@
     <uses-permission android:name="android.permission.BLUETOOTH" />
     <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" /> <!-- needed for API 28 -->
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+
+    <uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.SET_ALARM"/>
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
@@ -22,8 +23,8 @@
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/AppTheme.Launcher"
-        tools:ignore="AllowBackup,GoogleAppIndexingWarning">
-
+        tools:ignore="AllowBackup,GoogleAppIndexingWarning"
+        android:name="androidx.multidex.MultiDexApplication">
         <service
             android:name=".RadioService"
             android:enabled="true"
@@ -35,7 +36,8 @@
 
         <receiver android:name=".BootBroadcastReceiver"
             android:directBootAware="true"
-            tools:targetApi="n">
+            tools:targetApi="n"
+            android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.BOOT_COMPLETED" />
                 <action android:name="fr.forum_thalie.tsumugi.PLAY_OR_FALLBACK" />
@@ -47,9 +49,9 @@
         <activity
             android:name=".MainActivity"
             android:configChanges="orientation|screenSize"
-            android:label="@string/app_name"
             android:launchMode="singleTask"
-            android:screenOrientation="fullUser">
+            android:screenOrientation="fullUser"
+            android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
@@ -63,7 +65,8 @@
             android:parentActivityName=".MainActivity"
             android:screenOrientation="fullUser" />
 
-        <receiver android:name="androidx.media.session.MediaButtonReceiver">
+        <receiver android:name="androidx.media.session.MediaButtonReceiver"
+            android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MEDIA_BUTTON" />
             </intent-filter>
diff --git a/app/src/main/assets/planning_example.json b/app/src/main/assets/planning_example.json
index 96ac5b8..68380a9 100644
--- a/app/src/main/assets/planning_example.json
+++ b/app/src/main/assets/planning_example.json
@@ -7,15 +7,33 @@
       "hour_end": "7:00"
     },
     {
-      "title": "Jeux Vidéos Matin",
-      "periodicity": "1111100",
+      "title": "Tsumugi Rétro",
+      "periodicity": "1000000",
       "hour_begin": "09:00",
-      "hour_end": "10:30"
+      "hour_end": "12:00"
     },
     {
-      "title": "Anime Matin",
-      "periodicity": "1111100",
-      "hour_begin": "10:30",
+      "title": "Tournant du Millénaire",
+      "periodicity": "0100000",
+      "hour_begin": "09:00",
+      "hour_end": "12:00"
+    },
+    {
+      "title": "Tsumugi Netpop",
+      "periodicity": "0010000",
+      "hour_begin": "09:00",
+      "hour_end": "12:00"
+    },
+    {
+      "title": "Tsumugi Moderne",
+      "periodicity": "0001000",
+      "hour_begin": "09:00",
+      "hour_end": "12:00"
+    },
+    {
+      "title": "Tsumugi Très Récent",
+      "periodicity": "0000100",
+      "hour_begin": "09:00",
       "hour_end": "12:00"
     },
     {
diff --git a/app/src/main/java/fr/forum_thalie/tsumugi/BaseNotification.kt b/app/src/main/java/fr/forum_thalie/tsumugi/BaseNotification.kt
index ef0bc65..6ca19dc 100644
--- a/app/src/main/java/fr/forum_thalie/tsumugi/BaseNotification.kt
+++ b/app/src/main/java/fr/forum_thalie/tsumugi/BaseNotification.kt
@@ -50,6 +50,7 @@ abstract class BaseNotification(private val notificationChannelId: String,
         notificationManager.notify(notificationId, notification)
     }
 
+    @RequiresApi(Build.VERSION_CODES.M)
     open fun create(c: Context) {
         notificationManager = c.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
 
@@ -58,7 +59,7 @@ abstract class BaseNotification(private val notificationChannelId: String,
         // thanks to the launchMode specified in the Manifest : android:launchMode="singleTop"
         val pendingIntent = PendingIntent.getActivity(
             c, 0,
-            notificationIntent, 0
+            notificationIntent, PendingIntent.FLAG_IMMUTABLE
         )
         var channelID = ""
 
diff --git a/app/src/main/java/fr/forum_thalie/tsumugi/NowPlayingNotification.kt b/app/src/main/java/fr/forum_thalie/tsumugi/NowPlayingNotification.kt
index c5c6b63..c8b4ddc 100644
--- a/app/src/main/java/fr/forum_thalie/tsumugi/NowPlayingNotification.kt
+++ b/app/src/main/java/fr/forum_thalie/tsumugi/NowPlayingNotification.kt
@@ -3,8 +3,10 @@ package fr.forum_thalie.tsumugi
 import android.app.PendingIntent
 import android.content.Context
 import android.content.Intent
+import android.os.Build
 import android.support.v4.media.session.MediaSessionCompat
 import android.support.v4.media.session.PlaybackStateCompat
+import androidx.annotation.RequiresApi
 import androidx.core.app.NotificationCompat
 import fr.forum_thalie.tsumugi.playerstore.PlayerStore
 
@@ -34,7 +36,7 @@ class NowPlayingNotification(
         // got it right
         val delIntent = Intent(c, RadioService::class.java)
         delIntent.putExtra("action", Actions.KILL.name)
-        val deleteIntent = PendingIntent.getService(c, 0, delIntent, PendingIntent.FLAG_NO_CREATE)
+        val deleteIntent = PendingIntent.getService(c, 0, delIntent, PendingIntent.FLAG_NO_CREATE + PendingIntent.FLAG_IMMUTABLE)
         builder.setDeleteIntent(deleteIntent)
 
         mediaStyle = androidx.media.app.NotificationCompat.DecoratedMediaCustomViewStyle().also {
@@ -46,6 +48,7 @@ class NowPlayingNotification(
         update(c)
     }
 
+    @RequiresApi(Build.VERSION_CODES.M)
     fun update(c: Context, isUpdatingNotificationButton: Boolean = false, isRinging: Boolean = false) {
 
         if (isUpdatingNotificationButton)
@@ -72,17 +75,17 @@ class NowPlayingNotification(
 
             playPauseAction = if (PlayerStore.instance.playbackState.value == PlaybackStateCompat.STATE_PLAYING) {
                 intent.putExtra("action", Actions.PAUSE.name)
-                val pendingButtonIntent = PendingIntent.getService(c, 1, intent, PendingIntent.FLAG_UPDATE_CURRENT)
+                val pendingButtonIntent = PendingIntent.getService(c, 1, intent, PendingIntent.FLAG_UPDATE_CURRENT + PendingIntent.FLAG_IMMUTABLE)
                 NotificationCompat.Action.Builder(R.drawable.ic_pause, "Pause", pendingButtonIntent).build()
             } else {
                 intent.putExtra("action", Actions.PLAY.name)
-                val pendingButtonIntent = PendingIntent.getService(c, 1, intent, PendingIntent.FLAG_UPDATE_CURRENT)
+                val pendingButtonIntent = PendingIntent.getService(c, 1, intent, PendingIntent.FLAG_UPDATE_CURRENT + PendingIntent.FLAG_IMMUTABLE)
                 NotificationCompat.Action.Builder(R.drawable.ic_play,"Play", pendingButtonIntent).build()
             }
             builder.addAction(playPauseAction)
             val intent2 = Intent(c, RadioService::class.java)
             intent2.putExtra("action", Actions.KILL.name)
-            val pendingButtonIntent = PendingIntent.getService(c, 2, intent2, PendingIntent.FLAG_UPDATE_CURRENT)
+            val pendingButtonIntent = PendingIntent.getService(c, 2, intent2, PendingIntent.FLAG_UPDATE_CURRENT + PendingIntent.FLAG_IMMUTABLE)
             val stopAction = NotificationCompat.Action.Builder(R.drawable.ic_close,"Stop", pendingButtonIntent).build()
             builder.addAction(stopAction)
 
@@ -92,7 +95,7 @@ class NowPlayingNotification(
 
                 val snoozeIntent = Intent(c, RadioService::class.java)
                 snoozeIntent.putExtra("action", Actions.SNOOZE.name)
-                val pendingSnoozeIntent = PendingIntent.getService(c, 5, snoozeIntent, PendingIntent.FLAG_UPDATE_CURRENT)
+                val pendingSnoozeIntent = PendingIntent.getService(c, 5, snoozeIntent, PendingIntent.FLAG_UPDATE_CURRENT + PendingIntent.FLAG_IMMUTABLE)
                 val snoozeAction = NotificationCompat.Action.Builder(R.drawable.ic_alarm, "Snooze ($snoozeMinutes min.)", pendingSnoozeIntent ).build()
                 if (snoozeMinutes > 0)
                     builder.addAction(snoozeAction)
diff --git a/app/src/main/java/fr/forum_thalie/tsumugi/RadioService.kt b/app/src/main/java/fr/forum_thalie/tsumugi/RadioService.kt
index 1132477..ceda78f 100644
--- a/app/src/main/java/fr/forum_thalie/tsumugi/RadioService.kt
+++ b/app/src/main/java/fr/forum_thalie/tsumugi/RadioService.kt
@@ -193,7 +193,8 @@ class RadioService : MediaBrowserServiceCompat() {
 
         // Define managers
         telephonyManager = getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager
-        telephonyManager?.listen(phoneStateListener, PhoneStateListener.LISTEN_CALL_STATE)
+        // telephonyManager?.listen(phoneStateListener, PhoneStateListener.LISTEN_CALL_STATE)
+
         audioManager = getSystemService(Context.AUDIO_SERVICE) as AudioManager
 
         //define the audioFocusRequest
diff --git a/app/src/main/java/fr/forum_thalie/tsumugi/alarm/RadioAlarm.kt b/app/src/main/java/fr/forum_thalie/tsumugi/alarm/RadioAlarm.kt
index b64e8c5..80f4799 100644
--- a/app/src/main/java/fr/forum_thalie/tsumugi/alarm/RadioAlarm.kt
+++ b/app/src/main/java/fr/forum_thalie/tsumugi/alarm/RadioAlarm.kt
@@ -4,7 +4,9 @@ import android.app.AlarmManager
 import android.app.PendingIntent
 import android.content.Context
 import android.content.Intent
+import android.os.Build
 import android.util.Log
+import androidx.annotation.RequiresApi
 import androidx.core.app.AlarmManagerCompat
 import fr.forum_thalie.tsumugi.BootBroadcastReceiver
 import androidx.preference.PreferenceManager
@@ -27,11 +29,29 @@ class RadioAlarm {
     {
         alarmIntent = Intent(c, BootBroadcastReceiver::class.java).let { intent ->
             intent.putExtra("action", "$tag.${Actions.PLAY_OR_FALLBACK.name}")
-            PendingIntent.getBroadcast(c, 0, intent, 0)
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+                PendingIntent.getBroadcast(
+                    c,
+                    0,
+                    intent,
+                    PendingIntent.FLAG_IMMUTABLE
+                )
+            } else {
+                PendingIntent.getBroadcast(
+                    c,
+                    0,
+                    intent,
+                    0
+                )
+            }
         }
         showIntent = Intent(c, ParametersActivity::class.java).let { intent ->
             intent.putExtra("action", "alarm")
-            PendingIntent.getActivity(c, 0, intent, 0)
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+                PendingIntent.getActivity(c, 0, intent, PendingIntent.FLAG_IMMUTABLE)
+            } else {
+                PendingIntent.getActivity(c, 0, intent, 0)
+            }
         }
     }
 
@@ -43,6 +63,7 @@ class RadioAlarm {
         alarmManager.cancel(alarmIntent)
     }
 
+    @RequiresApi(Build.VERSION_CODES.M)
     fun setNextAlarm(c: Context, isForce: Boolean = false, forceTime: Int? = null, forceDays: Set<String>? = null)
     {
         defineIntents(c)
@@ -54,7 +75,7 @@ class RadioAlarm {
 
         val showIntent = Intent(c, ParametersActivity::class.java).let { intent ->
             intent.putExtra("action", ActionOpenParam.ALARM.name)
-            PendingIntent.getActivity(c, 0, intent, 0)
+            PendingIntent.getActivity(c, 0, intent, PendingIntent.FLAG_IMMUTABLE)
         }
         val time = findNextAlarmTime(c, forceTime, forceDays)
         if (time > 0)
diff --git a/app/src/main/java/fr/forum_thalie/tsumugi/alarm/RadioSleeper.kt b/app/src/main/java/fr/forum_thalie/tsumugi/alarm/RadioSleeper.kt
index fc5733c..c5ddcd8 100644
--- a/app/src/main/java/fr/forum_thalie/tsumugi/alarm/RadioSleeper.kt
+++ b/app/src/main/java/fr/forum_thalie/tsumugi/alarm/RadioSleeper.kt
@@ -4,7 +4,9 @@ import android.app.AlarmManager
 import android.app.PendingIntent
 import android.content.Context
 import android.content.Intent
+import android.os.Build
 import android.util.Log
+import androidx.annotation.RequiresApi
 import androidx.core.app.AlarmManagerCompat
 import androidx.lifecycle.MutableLiveData
 import androidx.preference.PreferenceManager
@@ -30,18 +32,20 @@ class RadioSleeper {
     private lateinit var sleepIntent: PendingIntent
     private lateinit var fadeOutIntent: PendingIntent
 
+    @RequiresApi(Build.VERSION_CODES.M)
     private fun defineIntents(c: Context)
     {
         sleepIntent = Intent(c, RadioService::class.java).let { intent ->
             intent.putExtra("action", Actions.KILL.name)
-            PendingIntent.getService(c, 99, intent, 0)
+            PendingIntent.getService(c, 99, intent, PendingIntent.FLAG_IMMUTABLE)
         }
         fadeOutIntent = Intent(c, RadioService::class.java).let { intent ->
             intent.putExtra("action", Actions.FADE_OUT.name)
-            PendingIntent.getService(c, 98, intent, 0)
+            PendingIntent.getService(c, 98, intent, PendingIntent.FLAG_IMMUTABLE)
         }
     }
 
+    @RequiresApi(Build.VERSION_CODES.M)
     fun setSleep(c: Context, isForce: Boolean = false, forceDuration: Long? = null)
     {
         defineIntents(c)
diff --git a/app/src/main/java/fr/forum_thalie/tsumugi/preferences/AlarmFragment.kt b/app/src/main/java/fr/forum_thalie/tsumugi/preferences/AlarmFragment.kt
index ceb2a38..d51b301 100644
--- a/app/src/main/java/fr/forum_thalie/tsumugi/preferences/AlarmFragment.kt
+++ b/app/src/main/java/fr/forum_thalie/tsumugi/preferences/AlarmFragment.kt
@@ -47,7 +47,7 @@ class AlarmFragment : PreferenceFragmentCompat() {
 
         fun updateIsWakingUpSummary(preference: SwitchPreferenceCompat?, newValue: Boolean? = true,  forceTime: Int? = null, forceDays: Set<String>? = null)
         {
-            val dateLong = RadioAlarm.instance.findNextAlarmTime(context!!, forceTime, forceDays)
+            val dateLong = RadioAlarm.instance.findNextAlarmTime(requireContext(), forceTime, forceDays)
             val calendar = Calendar.getInstance()
             calendar.timeInMillis = dateLong
             if (newValue == true && calendar.timeInMillis > 0)
@@ -65,14 +65,14 @@ class AlarmFragment : PreferenceFragmentCompat() {
 
         val hourOfDayDefault = 7
         val minuteDefault = 0
-        if (!PreferenceManager.getDefaultSharedPreferences(context!!).contains("alarmTimeFromMidnight"))
+        if (!PreferenceManager.getDefaultSharedPreferences(requireContext()).contains("alarmTimeFromMidnight"))
         {
-            PreferenceManager.getDefaultSharedPreferences(context!!).edit {
+            PreferenceManager.getDefaultSharedPreferences(requireContext()).edit {
                 putInt("alarmTimeFromMidnight", (60*hourOfDayDefault+minuteDefault))
                 commit()
             }
         }
-        val time = PreferenceManager.getDefaultSharedPreferences(context!!).getInt("alarmTimeFromMidnight", (60*hourOfDayDefault+minuteDefault))
+        val time = PreferenceManager.getDefaultSharedPreferences(requireContext()).getInt("alarmTimeFromMidnight", (60*hourOfDayDefault+minuteDefault))
         val hourOfDay = time / 60
         val minute = time % 60
         timeSet?.summary = "${if (hourOfDay < 10) "0" else ""}$hourOfDay:${if (minute < 10) "0" else ""}$minute"
@@ -80,16 +80,16 @@ class AlarmFragment : PreferenceFragmentCompat() {
 
         timeSet?.setOnPreferenceClickListener {
             val timePickerOnTimeSetListener = TimePickerDialog.OnTimeSetListener { _, hourOfDay, minute ->
-                PreferenceManager.getDefaultSharedPreferences(context!!).edit {
+                PreferenceManager.getDefaultSharedPreferences(requireContext()).edit {
                     putInt("alarmTimeFromMidnight", (60*hourOfDay+minute))
                     commit()
                 }
                 timeSet.summary = "${if (hourOfDay < 10) "0" else ""}$hourOfDay:${if (minute < 10) "0" else ""}$minute"
-                RadioAlarm.instance.cancelAlarm(context!!)
-                RadioAlarm.instance.setNextAlarm(context!!, isForce = true, forceTime = hourOfDay*60+minute)
+                RadioAlarm.instance.cancelAlarm(requireContext())
+                RadioAlarm.instance.setNextAlarm(requireContext(), isForce = true, forceTime = hourOfDay*60+minute)
                 updateIsWakingUpSummary(isWakingUp, isWakingUp?.isChecked, forceTime = hourOfDay*60+minute)
             }
-            val timeNew = PreferenceManager.getDefaultSharedPreferences(context!!).getInt("alarmTimeFromMidnight", 7*60)
+            val timeNew = PreferenceManager.getDefaultSharedPreferences(requireContext()).getInt("alarmTimeFromMidnight", 7*60)
             val hourOfDayNew = timeNew / 60
             val minuteNew = timeNew % 60
             val timePicker = TimePickerDialog(context, timePickerOnTimeSetListener, hourOfDayNew, minuteNew, true)
@@ -103,8 +103,8 @@ class AlarmFragment : PreferenceFragmentCompat() {
             val fullWeek = weekdays.toSet()
             val workingWeek = weekdays.toSet().minusElement(weekdays.last()).minusElement(weekdays.elementAt(weekdays.size - 2))
             val listOfDays = when (newValue) {
-                fullWeek -> context!!.getString(R.string.every_day)
-                workingWeek -> context!!.getString(R.string.working_days)
+                fullWeek -> requireContext().getString(R.string.every_day)
+                workingWeek -> requireContext().getString(R.string.working_days)
                 else -> {
                     // build ORDERED LIST of days... I don't know why the original one is in shambles!!
                     val fullWeekOrdered = weekdays
@@ -119,12 +119,12 @@ class AlarmFragment : PreferenceFragmentCompat() {
             preference?.summary = listOfDays
         }
 
-        updateDays(alarmDays, PreferenceManager.getDefaultSharedPreferences(context).getStringSet("alarmDays", setOf()))
+        updateDays(alarmDays, PreferenceManager.getDefaultSharedPreferences(requireContext()).getStringSet("alarmDays", setOf()))
         alarmDays?.setOnPreferenceChangeListener { preference, newValue ->
             @Suppress("UNCHECKED_CAST")
             updateDays(preference as MultiSelectListPreference, newValue as Set<String>)
-            RadioAlarm.instance.cancelAlarm(context!!)
-            RadioAlarm.instance.setNextAlarm(context!!, isForce = true, forceDays = newValue)
+            RadioAlarm.instance.cancelAlarm(requireContext())
+            RadioAlarm.instance.setNextAlarm(requireContext(), isForce = true, forceDays = newValue)
             updateIsWakingUpSummary(isWakingUp, isWakingUp?.isChecked, forceDays = newValue)
             true
         }
@@ -133,9 +133,9 @@ class AlarmFragment : PreferenceFragmentCompat() {
 
         isWakingUp?.setOnPreferenceChangeListener { _, newValue ->
             if (newValue as Boolean)
-                RadioAlarm.instance.setNextAlarm(context!!, isForce = true)
+                RadioAlarm.instance.setNextAlarm(requireContext(), isForce = true)
             else
-                RadioAlarm.instance.cancelAlarm(context!!)
+                RadioAlarm.instance.cancelAlarm(requireContext())
             timeSet?.isEnabled = newValue
             alarmDays?.isEnabled = newValue
             snoozeDuration?.isEnabled = newValue
diff --git a/build.gradle b/build.gradle
index 6f110b6..9160f7a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,16 +1,17 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.3.72'
+    ext.kotlin_version = '1.6.10'
     repositories {
         google()
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.1.1'
+        classpath 'com.android.tools.build:gradle:7.1.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
+
     }
 }