diff --git a/app/build.gradle b/app/build.gradle
index 7771286ac1..c2875906b1 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -234,7 +234,7 @@ dependencies {
 }
 
 buildscript {
-    ext.kotlin_version = '1.2.71'
+    ext.kotlin_version = '1.3.50'
     repositories {
         mavenCentral()
     }
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupRestoreService.kt b/app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupRestoreService.kt
index db6866e289..87701c20d9 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupRestoreService.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupRestoreService.kt
@@ -189,7 +189,7 @@ class BackupRestoreService : Service() {
 
         return Observable.just(Unit)
                 .map {
-                    val reader = JsonReader(contentResolver.openInputStream(uri).bufferedReader())
+                    val reader = JsonReader(contentResolver.openInputStream(uri)!!.bufferedReader())
                     val json = JsonParser().parse(reader).asJsonObject
 
                     // Get parser version
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateJob.kt b/app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateJob.kt
index ab386b1330..2fb2e5d83a 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateJob.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateJob.kt
@@ -22,7 +22,7 @@ class LibraryUpdateJob : Job() {
             val preferences = Injekt.get<PreferencesHelper>()
             val interval = prefInterval ?: preferences.libraryUpdateInterval().getOrDefault()
             if (interval > 0) {
-                val restrictions = preferences.libraryUpdateRestriction()
+                val restrictions = preferences.libraryUpdateRestriction()!!
                 val acRestriction = "ac" in restrictions
                 val wifiRestriction = if ("wifi" in restrictions)
                     JobRequest.NetworkType.UNMETERED
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/preference/SharedPreferencesDataStore.kt b/app/src/main/java/eu/kanade/tachiyomi/data/preference/SharedPreferencesDataStore.kt
index bb07bb0a52..8ac81e6b2b 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/preference/SharedPreferencesDataStore.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/preference/SharedPreferencesDataStore.kt
@@ -46,7 +46,7 @@ class SharedPreferencesDataStore(private val prefs: SharedPreferences) : Prefere
     }
 
     override fun getStringSet(key: String?, defValues: MutableSet<String>?): MutableSet<String> {
-        return prefs.getStringSet(key, defValues)
+        return prefs.getStringSet(key, defValues)!!
     }
 
     override fun putStringSet(key: String?, values: MutableSet<String>?) {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionInstallActivity.kt b/app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionInstallActivity.kt
index 421cfb191d..5dcd6bb126 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionInstallActivity.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionInstallActivity.kt
@@ -39,7 +39,7 @@ class ExtensionInstallActivity : Activity() {
     }
 
     private fun checkInstallationResult(resultCode: Int) {
-        val downloadId = intent.extras.getLong(ExtensionInstaller.EXTRA_DOWNLOAD_ID)
+        val downloadId = intent.extras!!.getLong(ExtensionInstaller.EXTRA_DOWNLOAD_ID)
         val success = resultCode == RESULT_OK
 
         val extensionManager = Injekt.get<ExtensionManager>()
diff --git a/app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionLoader.kt b/app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionLoader.kt
index 805effe064..450eae3127 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionLoader.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionLoader.kt
@@ -121,7 +121,7 @@ internal object ExtensionLoader {
 
         val classLoader = PathClassLoader(appInfo.sourceDir, null, context.classLoader)
 
-        val sources = appInfo.metaData.getString(METADATA_SOURCE_CLASS)
+        val sources = appInfo.metaData.getString(METADATA_SOURCE_CLASS)!!
                 .split(";")
                 .map {
                     val sourceClass = it.trim()
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/catalogue/SourceDividerItemDecoration.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/catalogue/SourceDividerItemDecoration.kt
index a4c33beb75..e21b58124f 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/catalogue/SourceDividerItemDecoration.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/catalogue/SourceDividerItemDecoration.kt
@@ -13,7 +13,7 @@ class SourceDividerItemDecoration(context: Context) : RecyclerView.ItemDecoratio
 
     init {
         val a = context.obtainStyledAttributes(intArrayOf(android.R.attr.listDivider))
-        divider = a.getDrawable(0)
+        divider = a.getDrawable(0)!!
         a.recycle()
     }
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/catalogue/global_search/CatalogueSearchAdapter.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/catalogue/global_search/CatalogueSearchAdapter.kt
index 0eabb89810..430b6f5b67 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/catalogue/global_search/CatalogueSearchAdapter.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/catalogue/global_search/CatalogueSearchAdapter.kt
@@ -38,7 +38,7 @@ class CatalogueSearchAdapter(val controller: CatalogueSearchController) :
 
     override fun onRestoreInstanceState(savedInstanceState: Bundle) {
         super.onRestoreInstanceState(savedInstanceState)
-        bundle = savedInstanceState.getBundle(HOLDER_BUNDLE_KEY)
+        bundle = savedInstanceState.getBundle(HOLDER_BUNDLE_KEY)!!
     }
 
     /**
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionDetailsController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionDetailsController.kt
index 2005a93889..d0c457f3ec 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionDetailsController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionDetailsController.kt
@@ -47,7 +47,7 @@ class ExtensionDetailsController(bundle: Bundle? = null) :
     }
 
     override fun createPresenter(): ExtensionDetailsPresenter {
-        return ExtensionDetailsPresenter(args.getString(PKGNAME_KEY))
+        return ExtensionDetailsPresenter(args.getString(PKGNAME_KEY)!!)
     }
 
     override fun getTitle(): String? {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionDividerItemDecoration.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionDividerItemDecoration.kt
index 40fe44505d..247206df7c 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionDividerItemDecoration.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionDividerItemDecoration.kt
@@ -13,7 +13,7 @@ class ExtensionDividerItemDecoration(context: Context) : RecyclerView.ItemDecora
 
     init {
         val a = context.obtainStyledAttributes(intArrayOf(android.R.attr.listDivider))
-        divider = a.getDrawable(0)
+        divider = a.getDrawable(0)!!
         a.recycle()
     }
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionTrustDialog.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionTrustDialog.kt
index 3094e90620..6c1f8bc0a0 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionTrustDialog.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/extension/ExtensionTrustDialog.kt
@@ -24,10 +24,10 @@ class ExtensionTrustDialog<T>(bundle: Bundle? = null) : DialogController(bundle)
                 .positiveText(R.string.ext_trust)
                 .negativeText(R.string.ext_uninstall)
                 .onPositive { _, _ ->
-                    (targetController as? Listener)?.trustSignature(args.getString(SIGNATURE_KEY))
+                    (targetController as? Listener)?.trustSignature(args.getString(SIGNATURE_KEY)!!)
                 }
                 .onNegative { _, _ ->
-                    (targetController as? Listener)?.uninstallExtension(args.getString(PKGNAME_KEY))
+                    (targetController as? Listener)?.uninstallExtension(args.getString(PKGNAME_KEY)!!)
                 }
                 .build()
     }
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt
index 5eadbacf0a..a8bee9cdcc 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt
@@ -4,6 +4,7 @@ import android.app.Activity
 import android.content.Intent
 import android.content.res.Configuration
 import android.graphics.Color
+import android.net.Uri
 import android.os.Bundle
 import android.support.design.widget.TabLayout
 import android.support.v4.graphics.drawable.DrawableCompat
@@ -512,9 +513,9 @@ class LibraryController(
 
             try {
                 // Get the file's input stream from the incoming Intent
-                activity.contentResolver.openInputStream(data.data).use {
+                activity.contentResolver.openInputStream(data.data ?: Uri.EMPTY).use {
                     // Update cover to selected file, show error if something went wrong
-                    if (presenter.editCoverWithStream(it, manga)) {
+                    if (it != null && presenter.editCoverWithStream(it, manga)) {
                         // TODO refresh cover
                     } else {
                         activity.toast(R.string.notification_cover_update_failed)
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/manga/info/MangaInfoController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/manga/info/MangaInfoController.kt
index 0589b8b086..6e018e3d23 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/manga/info/MangaInfoController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/manga/info/MangaInfoController.kt
@@ -521,7 +521,7 @@ class MangaInfoController : NucleusController<MangaInfoPresenter>(),
         val view = view ?: return
 
         val clipboard = activity.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
-        clipboard.primaryClip = ClipData.newPlainText(label, content)
+        clipboard.setPrimaryClip(ClipData.newPlainText(label, content))
 
         activity.toast(view.context.getString(R.string.copied_to_clipboard, content.truncateCenter(20)),
                 Toast.LENGTH_SHORT)
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/manga/track/TrackSearchAdapter.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/manga/track/TrackSearchAdapter.kt
index c11a9bdd0a..a4ea105ef4 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/manga/track/TrackSearchAdapter.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/manga/track/TrackSearchAdapter.kt
@@ -19,7 +19,7 @@ class TrackSearchAdapter(context: Context)
     override fun getView(position: Int, view: View?, parent: ViewGroup): View {
         var v = view
         // Get the data item for this position
-        val track = getItem(position)
+        val track = getItem(position)!!
         // Check if an existing view is being reused, otherwise inflate the view
         val holder: TrackSearchHolder // view lookup cache stored in tag
         if (v == null) {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt
index 1d5ef8f265..1547b863fd 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt
@@ -122,8 +122,8 @@ class ReaderActivity : BaseRxActivity<ReaderPresenter>() {
         setContentView(R.layout.reader_activity)
 
         if (presenter.needsInit()) {
-            val manga = intent.extras.getLong("manga", -1)
-            val chapter = intent.extras.getLong("chapter", -1)
+            val manga = intent.extras!!.getLong("manga", -1)
+            val chapter = intent.extras!!.getLong("chapter", -1)
 
             if (manga == -1L || chapter == -1L) {
                 finish()
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/DownloadPageLoader.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/DownloadPageLoader.kt
index af7d969305..c64947a321 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/DownloadPageLoader.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/DownloadPageLoader.kt
@@ -1,6 +1,7 @@
 package eu.kanade.tachiyomi.ui.reader.loader
 
 import android.app.Application
+import android.net.Uri
 import eu.kanade.tachiyomi.data.database.models.Manga
 import eu.kanade.tachiyomi.data.download.DownloadManager
 import eu.kanade.tachiyomi.source.Source
@@ -9,6 +10,7 @@ import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
 import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
 import rx.Observable
 import uy.kohesive.injekt.injectLazy
+import java.io.InputStream
 
 /**
  * Loader used to load a chapter from the downloaded chapters.
@@ -33,7 +35,7 @@ class DownloadPageLoader(
             .map { pages ->
                 pages.map { page ->
                     ReaderPage(page.index, page.url, page.imageUrl, {
-                        context.contentResolver.openInputStream(page.uri)
+                        context.contentResolver.openInputStream(page.uri ?: Uri.EMPTY)!!
                     }).apply {
                         status = Page.READY
                     }
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsBackupController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsBackupController.kt
index 597cc4eef2..804d097e59 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsBackupController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsBackupController.kt
@@ -158,7 +158,7 @@ class SettingsBackupController : SettingsController() {
                 if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {
                     val flags = Intent.FLAG_GRANT_READ_URI_PERMISSION or
                             Intent.FLAG_GRANT_WRITE_URI_PERMISSION
-
+                    if (uri != null)
                     activity.contentResolver.takePersistableUriPermission(uri, flags)
                 }
 
@@ -168,7 +168,7 @@ class SettingsBackupController : SettingsController() {
             CODE_BACKUP_CREATE -> if (data != null && resultCode == Activity.RESULT_OK) {
                 val activity = activity ?: return
                 val uri = if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
-                    val dir = data.data.path
+                    val dir = data.data?.path
                     val file = File(dir, Backup.getDefaultFilename())
 
                     Uri.fromFile(file)
@@ -177,6 +177,7 @@ class SettingsBackupController : SettingsController() {
                     val flags = Intent.FLAG_GRANT_READ_URI_PERMISSION or
                             Intent.FLAG_GRANT_WRITE_URI_PERMISSION
 
+                    if (uri != null)
                     activity.contentResolver.takePersistableUriPermission(uri, flags)
                     val file = UniFile.fromUri(activity, uri)
 
@@ -188,7 +189,8 @@ class SettingsBackupController : SettingsController() {
             }
             CODE_BACKUP_RESTORE -> if (data != null && resultCode == Activity.RESULT_OK) {
                 val uri = data.data
-                RestoreBackupDialog(uri).showDialog(router)
+                if (uri != null)
+                    RestoreBackupDialog(uri).showDialog(router)
             }
         }
     }
@@ -311,7 +313,7 @@ class SettingsBackupController : SettingsController() {
                         val context = applicationContext
                         if (context != null) {
                             RestoringBackupDialog().showDialog(router, TAG_RESTORING_BACKUP_DIALOG)
-                            BackupRestoreService.start(context, args.getParcelable(KEY_URI))
+                            BackupRestoreService.start(context, args.getParcelable(KEY_URI)!!)
                         }
                     }
                     .build()
@@ -385,7 +387,7 @@ class SettingsBackupController : SettingsController() {
                     .negativeText(R.string.action_open_log)
                     .onNegative { _, _ ->
                         val context = applicationContext ?: return@onNegative
-                        if (!path.isEmpty()) {
+                        if (!path!!.isEmpty()) {
                             val destFile = File(path, file)
                             val uri = destFile.getUriCompat(context)
                             val sendIntent = Intent(Intent.ACTION_VIEW).apply {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsDownloadController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsDownloadController.kt
index 1b6119b13c..ae53eeabad 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsDownloadController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsDownloadController.kt
@@ -118,8 +118,8 @@ class SettingsDownloadController : SettingsController() {
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
         when (requestCode) {
             DOWNLOAD_DIR_PRE_L -> if (data != null && resultCode == Activity.RESULT_OK) {
-                val uri = Uri.fromFile(File(data.data.path))
-                preferences.downloadsDirectory().set(uri.toString())
+                val uri = Uri.fromFile(File(data.data?.path))
+                preferences.downloadsDirectory().set(uri?.toString() ?: "")
             }
             DOWNLOAD_DIR_L -> if (data != null && resultCode == Activity.RESULT_OK) {
                 val context = applicationContext ?: return
@@ -128,7 +128,8 @@ class SettingsDownloadController : SettingsController() {
                         Intent.FLAG_GRANT_WRITE_URI_PERMISSION
 
                 @Suppress("NewApi")
-                context.contentResolver.takePersistableUriPermission(uri, flags)
+                if (uri != null)
+                    context.contentResolver.takePersistableUriPermission(uri, flags)
 
                 val file = UniFile.fromUri(context, uri)
                 preferences.downloadsDirectory().set(file.uri.toString())
diff --git a/app/src/main/java/eu/kanade/tachiyomi/util/LocaleHelper.kt b/app/src/main/java/eu/kanade/tachiyomi/util/LocaleHelper.kt
index 14e6726e3a..0cb6715f75 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/util/LocaleHelper.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/util/LocaleHelper.kt
@@ -30,7 +30,7 @@ object LocaleHelper {
     /**
      * The application's locale. When it's null, the system locale is used.
      */
-    private var appLocale = getLocaleFromString(preferences.lang())
+    private var appLocale = getLocaleFromString(preferences.lang() ?: "")
 
     /**
      * The currently applied locale. Used to avoid losing the selected language after a non locale
@@ -136,9 +136,9 @@ object LocaleHelper {
     private fun updateConfigLocale(config: Configuration, locale: Locale): Configuration {
         val newConfig = Configuration(config)
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
-            newConfig.locale = locale
+            newConfig.setLocale(locale)
         } else {
-            newConfig.locales = LocaleList(locale)
+            newConfig.setLocales(LocaleList(locale))
         }
         return newConfig
     }
diff --git a/build.gradle b/build.gradle
index 2885a88fc1..f34faa7ebe 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,10 +7,10 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.2.1'
-        classpath 'com.github.ben-manes:gradle-versions-plugin:0.17.0'
+        classpath 'com.android.tools.build:gradle:3.5.1'
+        classpath 'com.github.ben-manes:gradle-versions-plugin:0.22.0'
         classpath 'com.github.zellius:android-shortcut-gradle-plugin:0.1.2'
-        classpath 'com.google.gms:google-services:3.2.0'
+        classpath 'com.google.gms:google-services:4.3.2'
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index bccb59f891..56fac75514 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Tue Sep 25 08:47:56 CEST 2018
+#Sat Oct 26 14:20:49 PDT 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip