diff --git a/build.gradle b/build.gradle
index 09a87e5e6..3ee68695b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,7 +10,7 @@ buildscript {
         classpath 'com.android.tools.build:gradle:4.2.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "org.jetbrains.kotlin:kotlin-serialization:$kotlin_version"
-        classpath 'org.jmailen.gradle:kotlinter-gradle:3.3.0'
+        classpath 'org.jmailen.gradle:kotlinter-gradle:3.4.0'
     }
 }
 
diff --git a/common.gradle b/common.gradle
index 17dcf07fa..89b5ecb14 100644
--- a/common.gradle
+++ b/common.gradle
@@ -57,6 +57,7 @@ android {
 
     kotlinOptions {
         jvmTarget = JavaVersion.VERSION_1_8.toString()
+        freeCompilerArgs += "-Xopt-in=kotlinx.serialization.ExperimentalSerializationApi"
     }
 }
 
diff --git a/src/all/cubari/src/eu/kanade/tachiyomi/extension/all/cubari/RemoteStorageUtils.kt b/src/all/cubari/src/eu/kanade/tachiyomi/extension/all/cubari/RemoteStorageUtils.kt
index 0184dac56..ac47e7b53 100644
--- a/src/all/cubari/src/eu/kanade/tachiyomi/extension/all/cubari/RemoteStorageUtils.kt
+++ b/src/all/cubari/src/eu/kanade/tachiyomi/extension/all/cubari/RemoteStorageUtils.kt
@@ -10,7 +10,7 @@ import android.webkit.WebViewClient
 import okhttp3.Interceptor
 import okhttp3.Request
 import okhttp3.Response
-import okhttp3.ResponseBody
+import okhttp3.ResponseBody.Companion.toResponseBody
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
 import java.io.IOException
@@ -72,9 +72,7 @@ class RemoteStorageUtils {
 
                 webview.webViewClient = object : WebViewClient() {
                     override fun onPageFinished(view: WebView, url: String) {
-                        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
-                            view.evaluateJavascript(jsScript) {}
-                        }
+                        view.evaluateJavascript(jsScript) {}
                         if (transparent) {
                             latch.countDown()
                         }
@@ -94,7 +92,7 @@ class RemoteStorageUtils {
             return if (transparent) {
                 response
             } else {
-                response.newBuilder().body(ResponseBody.create(response.body?.contentType(), jsInterface.payload)).build()
+                response.newBuilder().body(jsInterface.payload.toResponseBody(response.body?.contentType())).build()
             }
         }
     }
diff --git a/src/all/myreadingmanga/src/eu/kanade/tachiyomi/extension/all/myreadingmanga/CloudflareWafInterceptor.kt b/src/all/myreadingmanga/src/eu/kanade/tachiyomi/extension/all/myreadingmanga/CloudflareWafInterceptor.kt
index 39809a054..2a5a37bfb 100644
--- a/src/all/myreadingmanga/src/eu/kanade/tachiyomi/extension/all/myreadingmanga/CloudflareWafInterceptor.kt
+++ b/src/all/myreadingmanga/src/eu/kanade/tachiyomi/extension/all/myreadingmanga/CloudflareWafInterceptor.kt
@@ -19,6 +19,7 @@ import java.io.IOException
 import java.util.concurrent.CountDownLatch
 import java.util.concurrent.TimeUnit
 
+// TODO: remove after new stable release
 class CloudflareWafInterceptor(private val cookieDomain: String) : Interceptor {
     private val context = Injekt.get<Application>()
     private val handler by lazy { Handler(Looper.getMainLooper()) }
diff --git a/src/ar/gmanga/src/eu/kanade/tachiyomi/extension/ar/gmanga/Gmanga.kt b/src/ar/gmanga/src/eu/kanade/tachiyomi/extension/ar/gmanga/Gmanga.kt
index bda21d9b8..d2329c11f 100644
--- a/src/ar/gmanga/src/eu/kanade/tachiyomi/extension/ar/gmanga/Gmanga.kt
+++ b/src/ar/gmanga/src/eu/kanade/tachiyomi/extension/ar/gmanga/Gmanga.kt
@@ -28,7 +28,6 @@ import okhttp3.Headers
 import okhttp3.MediaType.Companion.toMediaTypeOrNull
 import okhttp3.OkHttpClient
 import okhttp3.Request
-import okhttp3.RequestBody
 import okhttp3.RequestBody.Companion.toRequestBody
 import okhttp3.Response
 import uy.kohesive.injekt.injectLazy
diff --git a/src/en/mangadoom/src/eu/kanade/tachiyomi/extension/en/mangadoom/MangaDoom.kt b/src/en/mangadoom/src/eu/kanade/tachiyomi/extension/en/mangadoom/MangaDoom.kt
index b1cf3ab47..2a2b0467c 100644
--- a/src/en/mangadoom/src/eu/kanade/tachiyomi/extension/en/mangadoom/MangaDoom.kt
+++ b/src/en/mangadoom/src/eu/kanade/tachiyomi/extension/en/mangadoom/MangaDoom.kt
@@ -499,15 +499,15 @@ class MangaDoom : HttpSource() {
         private fun generateFilterContent(): List<Pair<String, String>>? {
             fun responseToGenreFilterContentPair(genreResponse: Response):
                 List<Pair<String, String>> {
-                    val document = genreResponse.asJsoup()
+                val document = genreResponse.asJsoup()
 
-                    return document.select("ul.manga-cat > li").map {
-                        Pair(
-                            it.select("span.fa").first().attr("data-id"),
-                            it.ownText()
-                        )
-                    }
+                return document.select("ul.manga-cat > li").map {
+                    Pair(
+                        it.select("span.fa").first().attr("data-id"),
+                        it.ownText()
+                    )
                 }
+            }
 
             val genreResponse = client
                 .newCall(
diff --git a/src/en/vizshonenjump/src/eu/kanade/tachiyomi/extension/en/vizshonenjump/VizImageInterceptor.kt b/src/en/vizshonenjump/src/eu/kanade/tachiyomi/extension/en/vizshonenjump/VizImageInterceptor.kt
index 6cf25bc6a..54ac90bfb 100644
--- a/src/en/vizshonenjump/src/eu/kanade/tachiyomi/extension/en/vizshonenjump/VizImageInterceptor.kt
+++ b/src/en/vizshonenjump/src/eu/kanade/tachiyomi/extension/en/vizshonenjump/VizImageInterceptor.kt
@@ -9,7 +9,7 @@ import com.drew.metadata.exif.ExifSubIFDDirectory
 import okhttp3.Interceptor
 import okhttp3.MediaType.Companion.toMediaTypeOrNull
 import okhttp3.Response
-import okhttp3.ResponseBody
+import okhttp3.ResponseBody.Companion.toResponseBody
 import java.io.ByteArrayInputStream
 import java.io.ByteArrayOutputStream
 import java.io.InputStream
@@ -23,7 +23,7 @@ class VizImageInterceptor : Interceptor {
             return response
 
         val image = decodeImage(response.body!!.byteStream())
-        val body = ResponseBody.create(MEDIA_TYPE, image)
+        val body = image.toResponseBody(MEDIA_TYPE)
         return response.newBuilder()
             .body(body)
             .build()
diff --git a/src/fr/japscan/src/eu/kanade/tachiyomi/extension/fr/japscan/Japscan.kt b/src/fr/japscan/src/eu/kanade/tachiyomi/extension/fr/japscan/Japscan.kt
index 3d27bd256..1d5ede348 100644
--- a/src/fr/japscan/src/eu/kanade/tachiyomi/extension/fr/japscan/Japscan.kt
+++ b/src/fr/japscan/src/eu/kanade/tachiyomi/extension/fr/japscan/Japscan.kt
@@ -1,13 +1,11 @@
 package eu.kanade.tachiyomi.extension.fr.japscan
 
 import android.annotation.SuppressLint
-import android.annotation.TargetApi
 import android.app.Application
 import android.content.SharedPreferences
 import android.graphics.Bitmap
 import android.graphics.Canvas
 import android.net.Uri
-import android.os.Build
 import android.os.Handler
 import android.os.Looper
 import android.util.Log
@@ -377,7 +375,6 @@ class Japscan : ConfigurableSource, ParsedHttpSource() {
                     webview.settings.domStorageEnabled = true
                     webview.settings.userAgentString = webview.settings.userAgentString.replace("Mobile", "eliboM").replace("Android", "diordnA")
                     webview.webViewClient = object : WebViewClient() {
-                        @TargetApi(Build.VERSION_CODES.LOLLIPOP)
                         override fun shouldInterceptRequest(
                             view: WebView,
                             request: WebResourceRequest
diff --git a/src/ru/comx/src/eu/kanade/tachiyomi/extension/ru/comx/ComX.kt b/src/ru/comx/src/eu/kanade/tachiyomi/extension/ru/comx/ComX.kt
index cd491ea82..e262a6d66 100644
--- a/src/ru/comx/src/eu/kanade/tachiyomi/extension/ru/comx/ComX.kt
+++ b/src/ru/comx/src/eu/kanade/tachiyomi/extension/ru/comx/ComX.kt
@@ -122,25 +122,25 @@ class ComX : ParsedHttpSource() {
 
     override fun searchMangaRequest(page: Int, query: String, filters: FilterList): Request {
         /** val url = "$baseUrl/index.php?do=xsearch&searchCat=comix-read&page=$page".toHttpUrlOrNull()!!.newBuilder()
-        (if (filters.isEmpty()) getFilterList() else filters).forEach { filter ->
-        when (filter) {
-        is TypeList -> filter.state.forEach { type ->
-        if (type.state) {
-        url.addQueryParameter("field[type][${type.id}]", 1.toString())
-        }
-        }
-        is PubList -> filter.state.forEach { publisher ->
-        if (publisher.state) {
-        url.addQueryParameter("subCat[]", publisher.id)
-        }
-        }
-        is GenreList -> filter.state.forEach { genre ->
-        if (genre.state) {
-        url.addQueryParameter("field[genre][${genre.id}]", 1.toString())
-        }
-        }
-        }
-        }**/
+         (if (filters.isEmpty()) getFilterList() else filters).forEach { filter ->
+         when (filter) {
+         is TypeList -> filter.state.forEach { type ->
+         if (type.state) {
+         url.addQueryParameter("field[type][${type.id}]", 1.toString())
+         }
+         }
+         is PubList -> filter.state.forEach { publisher ->
+         if (publisher.state) {
+         url.addQueryParameter("subCat[]", publisher.id)
+         }
+         }
+         is GenreList -> filter.state.forEach { genre ->
+         if (genre.state) {
+         url.addQueryParameter("field[genre][${genre.id}]", 1.toString())
+         }
+         }
+         }
+         }**/
         if (query.isNotEmpty()) {
             return POST(
                 "$baseUrl/index.php?do=search&search_start=$page",
@@ -259,102 +259,102 @@ class ComX : ParsedHttpSource() {
         return GET(page.imageUrl!!, headers)
     }
     /**
-    private class CheckFilter(name: String, val id: String) : Filter.CheckBox(name)
+     private class CheckFilter(name: String, val id: String) : Filter.CheckBox(name)
 
-    private class TypeList(types: List<CheckFilter>) : Filter.Group<CheckFilter>("Тип выпуска", types)
-    private class PubList(publishers: List<CheckFilter>) : Filter.Group<CheckFilter>("Разделы", publishers)
-    private class GenreList(genres: List<CheckFilter>) : Filter.Group<CheckFilter>("Жанры", genres)
+     private class TypeList(types: List<CheckFilter>) : Filter.Group<CheckFilter>("Тип выпуска", types)
+     private class PubList(publishers: List<CheckFilter>) : Filter.Group<CheckFilter>("Разделы", publishers)
+     private class GenreList(genres: List<CheckFilter>) : Filter.Group<CheckFilter>("Жанры", genres)
 
-    override fun getFilterList() = FilterList(
-    TypeList(getTypeList()),
-    PubList(getPubList()),
-    GenreList(getGenreList()),
-    )
+     override fun getFilterList() = FilterList(
+     TypeList(getTypeList()),
+     PubList(getPubList()),
+     GenreList(getGenreList()),
+     )
 
-    private fun getTypeList() = listOf(
-    CheckFilter("Лимитка", "1"),
-    CheckFilter("Ван шот", "2"),
-    CheckFilter("Графический Роман", "3"),
-    CheckFilter("Онгоинг", "4"),
-    )
+     private fun getTypeList() = listOf(
+     CheckFilter("Лимитка", "1"),
+     CheckFilter("Ван шот", "2"),
+     CheckFilter("Графический Роман", "3"),
+     CheckFilter("Онгоинг", "4"),
+     )
 
-    private fun getPubList() = listOf(
-    CheckFilter("Marvel", "2"),
-    CheckFilter("DC Comics", "14"),
-    CheckFilter("Dark Horse", "7"),
-    CheckFilter("IDW Publishing", "6"),
-    CheckFilter("Image", "4"),
-    CheckFilter("Vertigo", "8"),
-    CheckFilter("Dynamite Entertainment", "10"),
-    CheckFilter("Wildstorm", "5"),
-    CheckFilter("Avatar Press", "11"),
-    CheckFilter("Boom! Studios", "12"),
-    CheckFilter("Top Cow", "9"),
-    CheckFilter("Oni Press", "13"),
-    CheckFilter("Valiant", "15"),
-    CheckFilter("Icon Comics", "16"),
-    CheckFilter("Manga", "3"),
-    CheckFilter("Manhua", "45"),
-    CheckFilter("Manhwa", "44"),
-    CheckFilter("Разные комиксы", "18")
-    )
+     private fun getPubList() = listOf(
+     CheckFilter("Marvel", "2"),
+     CheckFilter("DC Comics", "14"),
+     CheckFilter("Dark Horse", "7"),
+     CheckFilter("IDW Publishing", "6"),
+     CheckFilter("Image", "4"),
+     CheckFilter("Vertigo", "8"),
+     CheckFilter("Dynamite Entertainment", "10"),
+     CheckFilter("Wildstorm", "5"),
+     CheckFilter("Avatar Press", "11"),
+     CheckFilter("Boom! Studios", "12"),
+     CheckFilter("Top Cow", "9"),
+     CheckFilter("Oni Press", "13"),
+     CheckFilter("Valiant", "15"),
+     CheckFilter("Icon Comics", "16"),
+     CheckFilter("Manga", "3"),
+     CheckFilter("Manhua", "45"),
+     CheckFilter("Manhwa", "44"),
+     CheckFilter("Разные комиксы", "18")
+     )
 
-    private fun getGenreList() = listOf(
-    CheckFilter("Sci-Fi", "2"),
-    CheckFilter("Антиутопия", "3"),
-    CheckFilter("Апокалипсис", "4"),
-    CheckFilter("Боевик", "5"),
-    CheckFilter("Боевые искусства", "6"),
-    CheckFilter("Вампиры", "7"),
-    CheckFilter("Вестерн", "8"),
-    CheckFilter("Военный", "9"),
-    CheckFilter("Детектив", "10"),
-    CheckFilter("Драма", "11"),
-    CheckFilter("Зомби", "12"),
-    CheckFilter("Игры", "13"),
-    CheckFilter("Исекай", "14"),
-    CheckFilter("Исторический", "15"),
-    CheckFilter("Киберпанк", "16"),
-    CheckFilter("Комедия", "17"),
-    CheckFilter("Космоопера", "18"),
-    CheckFilter("Космос", "19"),
-    CheckFilter("Криминал", "20"),
-    CheckFilter("МелоДрама", "21"),
-    CheckFilter("Мистика", "22"),
-    CheckFilter("Научная Фантастика", "23"),
-    CheckFilter("Неотвратимость", "24"),
-    CheckFilter("Нуар", "25"),
-    CheckFilter("Паника", "26"),
-    CheckFilter("Пародия", "27"),
-    CheckFilter("Повседневность", "28"),
-    CheckFilter("Постапокалиптика", "29"),
-    CheckFilter("ПредательСредиНас", "30"),
-    CheckFilter("Приключения", "31"),
-    CheckFilter("Путешествия во времени", "32"),
-    CheckFilter("Сверхъестественное", "33"),
-    CheckFilter("Слэшер", "34"),
-    CheckFilter("Смерть", "35"),
-    CheckFilter("Супергерои", "36"),
-    CheckFilter("Супергероика", "37"),
-    CheckFilter("Сёнен", "38"),
-    CheckFilter("Тревога", "39"),
-    CheckFilter("Триллер", "40"),
-    CheckFilter("Ужасы", "41"),
-    CheckFilter("Фантасмагория", "42"),
-    CheckFilter("Фантастика", "43"),
-    CheckFilter("Фэнтези", "44"),
-    CheckFilter("Экшен", "45"),
-    CheckFilter("Экшн", "46"),
-    CheckFilter("Эротика", "47"),
-    CheckFilter("сэйнэн", "66"),
-    CheckFilter("сёдзё", "67"),
-    CheckFilter("сёнэн", "68"),
-    CheckFilter("сёнэн-ай", "69"),
-    CheckFilter("трагедия", "70"),
-    CheckFilter("фэнтези", "73"),
-    CheckFilter("школа", "74"),
-    CheckFilter("этти", "76"),
-    CheckFilter("яой", "77"),
+     private fun getGenreList() = listOf(
+     CheckFilter("Sci-Fi", "2"),
+     CheckFilter("Антиутопия", "3"),
+     CheckFilter("Апокалипсис", "4"),
+     CheckFilter("Боевик", "5"),
+     CheckFilter("Боевые искусства", "6"),
+     CheckFilter("Вампиры", "7"),
+     CheckFilter("Вестерн", "8"),
+     CheckFilter("Военный", "9"),
+     CheckFilter("Детектив", "10"),
+     CheckFilter("Драма", "11"),
+     CheckFilter("Зомби", "12"),
+     CheckFilter("Игры", "13"),
+     CheckFilter("Исекай", "14"),
+     CheckFilter("Исторический", "15"),
+     CheckFilter("Киберпанк", "16"),
+     CheckFilter("Комедия", "17"),
+     CheckFilter("Космоопера", "18"),
+     CheckFilter("Космос", "19"),
+     CheckFilter("Криминал", "20"),
+     CheckFilter("МелоДрама", "21"),
+     CheckFilter("Мистика", "22"),
+     CheckFilter("Научная Фантастика", "23"),
+     CheckFilter("Неотвратимость", "24"),
+     CheckFilter("Нуар", "25"),
+     CheckFilter("Паника", "26"),
+     CheckFilter("Пародия", "27"),
+     CheckFilter("Повседневность", "28"),
+     CheckFilter("Постапокалиптика", "29"),
+     CheckFilter("ПредательСредиНас", "30"),
+     CheckFilter("Приключения", "31"),
+     CheckFilter("Путешествия во времени", "32"),
+     CheckFilter("Сверхъестественное", "33"),
+     CheckFilter("Слэшер", "34"),
+     CheckFilter("Смерть", "35"),
+     CheckFilter("Супергерои", "36"),
+     CheckFilter("Супергероика", "37"),
+     CheckFilter("Сёнен", "38"),
+     CheckFilter("Тревога", "39"),
+     CheckFilter("Триллер", "40"),
+     CheckFilter("Ужасы", "41"),
+     CheckFilter("Фантасмагория", "42"),
+     CheckFilter("Фантастика", "43"),
+     CheckFilter("Фэнтези", "44"),
+     CheckFilter("Экшен", "45"),
+     CheckFilter("Экшн", "46"),
+     CheckFilter("Эротика", "47"),
+     CheckFilter("сэйнэн", "66"),
+     CheckFilter("сёдзё", "67"),
+     CheckFilter("сёнэн", "68"),
+     CheckFilter("сёнэн-ай", "69"),
+     CheckFilter("трагедия", "70"),
+     CheckFilter("фэнтези", "73"),
+     CheckFilter("школа", "74"),
+     CheckFilter("этти", "76"),
+     CheckFilter("яой", "77"),
 
-    )**/
+     )**/
 }
diff --git a/src/zh/tencentcomics/src/eu/kanade/tachiyomi/extension/zh/tencentcomics/TencentComics.kt b/src/zh/tencentcomics/src/eu/kanade/tachiyomi/extension/zh/tencentcomics/TencentComics.kt
index 54013305f..c5f8e11bf 100644
--- a/src/zh/tencentcomics/src/eu/kanade/tachiyomi/extension/zh/tencentcomics/TencentComics.kt
+++ b/src/zh/tencentcomics/src/eu/kanade/tachiyomi/extension/zh/tencentcomics/TencentComics.kt
@@ -37,7 +37,7 @@ class TencentComics : ParsedHttpSource() {
     override val lang = "zh"
 
     override val supportsLatest = true
-    
+
     override val id: Long = 6353436350537369479
 
     override val client: OkHttpClient = network.cloudflareClient