diff --git a/app/build.gradle b/app/build.gradle
index 35bdd998e..07c34281d 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,13 +1,12 @@
 plugins {
-    id "org.sonarqube" version "3.1.1"
+    id "com.android.application"
+    id "kotlin-android"
+    id "kotlin-kapt"
+    id "kotlin-parcelize"
+    id "checkstyle"
+    id "org.sonarqube" version "3.3"
 }
 
-apply plugin: 'com.android.application'
-apply plugin: 'kotlin-android'
-apply plugin: 'kotlin-parcelize'
-apply plugin: 'kotlin-kapt'
-apply plugin: 'checkstyle'
-
 android {
     compileSdkVersion 30
     buildToolsVersion '30.0.3'
@@ -80,13 +79,13 @@ android {
         // Flag to enable support for the new language APIs
         coreLibraryDesugaringEnabled true
 
-        sourceCompatibility JavaVersion.VERSION_1_8
-        targetCompatibility JavaVersion.VERSION_1_8
+        sourceCompatibility JavaVersion.VERSION_11
+        targetCompatibility JavaVersion.VERSION_11
         encoding 'utf-8'
     }
 
     kotlinOptions {
-        jvmTarget = JavaVersion.VERSION_1_8
+        jvmTarget = JavaVersion.VERSION_11
     }
 
     sourceSets {
@@ -99,7 +98,7 @@ android {
 }
 
 ext {
-    checkstyleVersion = '8.38'
+    checkstyleVersion = '9.2'
 
     androidxLifecycleVersion = '2.3.1'
     androidxRoomVersion = '2.3.0'
@@ -193,7 +192,7 @@ dependencies {
 
 /** Checkstyle **/
     checkstyle "com.puppycrawl.tools:checkstyle:${checkstyleVersion}"
-    ktlint 'com.pinterest:ktlint:0.40.0'
+    ktlint 'com.pinterest:ktlint:0.43.2'
 
 /** Kotlin **/
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:${kotlin_version}"
diff --git a/app/src/main/java/org/schabi/newpipe/local/feed/service/FeedLoadService.kt b/app/src/main/java/org/schabi/newpipe/local/feed/service/FeedLoadService.kt
index 98ff5914d..5bc097fe5 100644
--- a/app/src/main/java/org/schabi/newpipe/local/feed/service/FeedLoadService.kt
+++ b/app/src/main/java/org/schabi/newpipe/local/feed/service/FeedLoadService.kt
@@ -183,28 +183,23 @@ class FeedLoadService : Service() {
 
         subscriptions
             .take(1)
-
             .doOnNext {
                 currentProgress.set(0)
                 maxProgress.set(it.size)
             }
             .filter { it.isNotEmpty() }
-
             .observeOn(AndroidSchedulers.mainThread())
             .doOnNext {
                 startForeground(NOTIFICATION_ID, notificationBuilder.build())
                 updateNotificationProgress(null)
                 broadcastProgress()
             }
-
             .observeOn(Schedulers.io())
             .flatMap { Flowable.fromIterable(it) }
             .takeWhile { !cancelSignal.get() }
-
             .parallel(PARALLEL_EXTRACTIONS, PARALLEL_EXTRACTIONS * 2)
             .runOn(Schedulers.io(), PARALLEL_EXTRACTIONS * 2)
             .filter { !cancelSignal.get() }
-
             .map { subscriptionEntity ->
                 var error: Throwable? = null
                 try {
@@ -239,14 +234,11 @@ class FeedLoadService : Service() {
                 }
             }
             .sequential()
-
             .observeOn(AndroidSchedulers.mainThread())
             .doOnNext(notificationsConsumer)
-
             .observeOn(Schedulers.io())
             .buffer(BUFFER_COUNT_BEFORE_INSERT)
             .doOnNext(databaseConsumer)
-
             .subscribeOn(Schedulers.io())
             .observeOn(AndroidSchedulers.mainThread())
             .subscribe(resultSubscriber)
diff --git a/app/src/test/java/org/schabi/newpipe/settings/ContentSettingsManagerTest.kt b/app/src/test/java/org/schabi/newpipe/settings/ContentSettingsManagerTest.kt
index 2311b41ce..ec41a77f8 100644
--- a/app/src/test/java/org/schabi/newpipe/settings/ContentSettingsManagerTest.kt
+++ b/app/src/test/java/org/schabi/newpipe/settings/ContentSettingsManagerTest.kt
@@ -9,12 +9,12 @@ import org.junit.Before
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.mockito.Mockito
-import org.mockito.Mockito.`when`
 import org.mockito.Mockito.anyBoolean
 import org.mockito.Mockito.anyInt
 import org.mockito.Mockito.anyString
 import org.mockito.Mockito.atLeastOnce
 import org.mockito.Mockito.verify
+import org.mockito.Mockito.`when`
 import org.mockito.Mockito.withSettings
 import org.mockito.junit.MockitoJUnitRunner
 import org.schabi.newpipe.streams.io.StoredFileHelper