diff --git a/build.gradle b/build.gradle
index 69aa8504..fe803682 100644
--- a/build.gradle
+++ b/build.gradle
@@ -12,7 +12,7 @@ buildscript {
         }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0-beta02'
+        classpath 'com.android.tools.build:gradle:3.5.0-beta04'
         classpath 'com.github.ben-manes:gradle-versions-plugin:0.21.0'
         classpath 'com.google.gms:google-services:4.2.0'
         classpath 'io.fabric.tools:gradle:1.29.0'
diff --git a/mobile/build.gradle b/mobile/build.gradle
index 78ed3dfb..4e2843eb 100644
--- a/mobile/build.gradle
+++ b/mobile/build.gradle
@@ -9,7 +9,7 @@ if (!getGradle().getStartParameter().getTaskRequests().toString().contains("Fdro
 }
 
 android {
-    compileSdkVersion 'android-Q'
+    compileSdkVersion 29
     compileOptions {
         sourceCompatibility 1.8
         targetCompatibility 1.8
@@ -17,7 +17,7 @@ android {
     defaultConfig {
         applicationId "be.mygod.vpnhotspot"
         minSdkVersion 21
-        targetSdkVersion 28
+        targetSdkVersion 29
         resConfigs "ru", "zh-rCN"
         versionCode 204
         versionName '2.4.4'
@@ -73,15 +73,15 @@ dependencies {
     kapt "androidx.room:room-compiler:$roomVersion"
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation 'androidx.browser:browser:1.0.0'
-    implementation 'androidx.core:core-ktx:1.1.0-beta01'
+    implementation 'androidx.core:core-ktx:1.1.0-rc01'
     implementation 'androidx.emoji:emoji:1.0.0'
     implementation "androidx.lifecycle:lifecycle-common-java8:$lifecycleVersion"
     implementation "androidx.lifecycle:lifecycle-extensions:$lifecycleVersion"
     implementation "androidx.lifecycle:lifecycle-livedata-ktx:$lifecycleVersion"
     implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycleVersion"
-    implementation 'androidx.preference:preference:1.1.0-alpha05'
+    implementation 'androidx.preference:preference:1.1.0-beta01'
     implementation "androidx.room:room-ktx:$roomVersion"
-    implementation 'com.android.billingclient:billing:2.0.0'
+    implementation 'com.android.billingclient:billing:2.0.1'
     implementation 'com.github.topjohnwu.libsu:core:2.5.0'
     implementation 'com.google.android.material:material:1.1.0-alpha07'
     implementation 'com.jakewharton.timber:timber:4.7.1'
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt b/mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt
index 1ae1e42d..19f882f8 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt
@@ -13,7 +13,6 @@ import android.os.Looper
 import androidx.annotation.StringRes
 import androidx.core.content.edit
 import androidx.core.content.getSystemService
-import androidx.core.os.BuildCompat
 import be.mygod.vpnhotspot.App.Companion.app
 import be.mygod.vpnhotspot.net.wifi.WifiP2pManagerHelper
 import be.mygod.vpnhotspot.net.wifi.WifiP2pManagerHelper.deletePersistentGroup
@@ -161,7 +160,7 @@ class RepeaterService : Service(), WifiP2pManager.ChannelListener, SharedPrefere
     override fun onCreate() {
         super.onCreate()
         onChannelDisconnected()
-        if (!BuildCompat.isAtLeastQ()) @Suppress("DEPRECATION") {
+        if (Build.VERSION.SDK_INT < 29) @Suppress("DEPRECATION") {
             registerReceiver(deviceListener, intentFilter(WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION,
                     WifiP2pManagerHelper.WIFI_P2P_PERSISTENT_GROUPS_CHANGED_ACTION))
             app.pref.registerOnSharedPreferenceChangeListener(this)
@@ -194,7 +193,7 @@ class RepeaterService : Service(), WifiP2pManager.ChannelListener, SharedPrefere
         channel = null
         if (status != Status.DESTROYED) try {
             channel = p2pManager.initialize(this, Looper.getMainLooper(), this)
-            if (!BuildCompat.isAtLeastQ()) @Suppress("DEPRECATION") setOperatingChannel()
+            if (Build.VERSION.SDK_INT < 29) @Suppress("DEPRECATION") setOperatingChannel()
         } catch (e: RuntimeException) {
             Timber.w(e)
             handler.postDelayed(this::onChannelDisconnected, 1000)
@@ -282,7 +281,7 @@ class RepeaterService : Service(), WifiP2pManager.ChannelListener, SharedPrefere
         val networkName = networkName
         val passphrase = passphrase
         try {
-            if (!BuildCompat.isAtLeastQ() || networkName == null || passphrase == null) {
+            if (Build.VERSION.SDK_INT < 29 || networkName == null || passphrase == null) {
                 persistNextGroup = true
                 p2pManager.createGroup(channel, listener)
             } else p2pManager.createGroup(channel, WifiP2pConfig.Builder().apply {
@@ -392,7 +391,7 @@ class RepeaterService : Service(), WifiP2pManager.ChannelListener, SharedPrefere
         handler.removeCallbacksAndMessages(null)
         if (status != Status.IDLE) binder.shutdown()
         clean() // force clean to prevent leakage
-        if (!BuildCompat.isAtLeastQ()) @Suppress("DEPRECATION") {
+        if (Build.VERSION.SDK_INT < 29) @Suppress("DEPRECATION") {
             app.pref.unregisterOnSharedPreferenceChangeListener(this)
             unregisterReceiver(deviceListener)
         }
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/manage/LocalOnlyHotspotManager.kt b/mobile/src/main/java/be/mygod/vpnhotspot/manage/LocalOnlyHotspotManager.kt
index 2b0de909..db30b982 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/manage/LocalOnlyHotspotManager.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/manage/LocalOnlyHotspotManager.kt
@@ -14,7 +14,6 @@ import android.provider.Settings
 import android.view.View
 import android.widget.Toast
 import androidx.core.content.getSystemService
-import androidx.core.os.BuildCompat
 import androidx.core.os.bundleOf
 import androidx.recyclerview.widget.RecyclerView
 import be.mygod.vpnhotspot.DebugHelper
@@ -29,7 +28,7 @@ import java.net.NetworkInterface
 @TargetApi(26)
 class LocalOnlyHotspotManager(private val parent: TetheringFragment) : Manager(), ServiceConnection {
     companion object {
-        val permission = if (BuildCompat.isAtLeastQ())
+        val permission = if (Build.VERSION.SDK_INT >= 29)
             Manifest.permission.ACCESS_FINE_LOCATION else Manifest.permission.ACCESS_COARSE_LOCATION
     }
 
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/manage/RepeaterManager.kt b/mobile/src/main/java/be/mygod/vpnhotspot/manage/RepeaterManager.kt
index f23bb7fd..6716b8a7 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/manage/RepeaterManager.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/manage/RepeaterManager.kt
@@ -18,7 +18,6 @@ import android.view.WindowManager
 import android.widget.EditText
 import androidx.appcompat.app.AlertDialog
 import androidx.core.content.ContextCompat
-import androidx.core.os.BuildCompat
 import androidx.databinding.BaseObservable
 import androidx.databinding.Bindable
 import androidx.lifecycle.ViewModel
@@ -33,7 +32,6 @@ import be.mygod.vpnhotspot.util.formatAddresses
 import be.mygod.vpnhotspot.widget.SmartSnackbar
 import kotlinx.android.parcel.Parcelize
 import timber.log.Timber
-import java.lang.IllegalArgumentException
 import java.net.NetworkInterface
 import java.net.SocketException
 
@@ -56,7 +54,7 @@ class RepeaterManager(private val parent: TetheringFragment) : Manager(), Servic
             }
 
         val title: CharSequence @Bindable get() {
-            if (BuildCompat.isAtLeastQ()) binder?.group?.frequency?.let {
+            if (Build.VERSION.SDK_INT >= 29) binder?.group?.frequency?.let {
                 return parent.getString(R.string.repeater_channel, it, frequencyToChannel(it))
             }
             return parent.getString(R.string.title_repeater)
@@ -76,7 +74,7 @@ class RepeaterManager(private val parent: TetheringFragment) : Manager(), Servic
         }
         fun onGroupChanged(group: WifiP2pGroup? = null) {
             p2pInterface = group?.`interface`
-            if (BuildCompat.isAtLeastQ()) notifyPropertyChanged(BR.title)
+            if (Build.VERSION.SDK_INT >= 29) notifyPropertyChanged(BR.title)
             notifyPropertyChanged(BR.addresses)
         }
 
@@ -85,7 +83,7 @@ class RepeaterManager(private val parent: TetheringFragment) : Manager(), Servic
             when (binder?.service?.status) {
                 RepeaterService.Status.IDLE -> {
                     val context = parent.requireContext()
-                    if (BuildCompat.isAtLeastQ() && context.checkSelfPermission(
+                    if (Build.VERSION.SDK_INT >= 29 && context.checkSelfPermission(
                                     Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                         parent.requestPermissions(arrayOf(Manifest.permission.ACCESS_FINE_LOCATION),
                                 TetheringFragment.START_REPEATER)
@@ -165,7 +163,7 @@ class RepeaterManager(private val parent: TetheringFragment) : Manager(), Servic
     }
 
     val configuration: WifiConfiguration? get() {
-        if (BuildCompat.isAtLeastQ()) {
+        if (Build.VERSION.SDK_INT >= 29) {
             val networkName = RepeaterService.networkName
             val passphrase = RepeaterService.passphrase
             if (networkName != null && passphrase != null) {
@@ -200,7 +198,7 @@ class RepeaterManager(private val parent: TetheringFragment) : Manager(), Servic
         return null
     }
     fun updateConfiguration(config: WifiConfiguration) {
-        if (BuildCompat.isAtLeastQ()) {
+        if (Build.VERSION.SDK_INT >= 29) {
             RepeaterService.networkName = config.SSID
             RepeaterService.passphrase = config.preSharedKey
             RepeaterService.operatingBand = when (config.apBand) {
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/net/IpNeighbour.kt b/mobile/src/main/java/be/mygod/vpnhotspot/net/IpNeighbour.kt
index 4a4a88ed..603aeecd 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/IpNeighbour.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/IpNeighbour.kt
@@ -1,15 +1,14 @@
 package be.mygod.vpnhotspot.net
 
+import android.os.Build
 import android.system.ErrnoException
 import android.system.OsConstants
-import androidx.core.os.BuildCompat
 import be.mygod.vpnhotspot.room.macToLong
 import be.mygod.vpnhotspot.util.parseNumericAddress
 import timber.log.Timber
 import java.io.File
 import java.io.FileNotFoundException
 import java.io.IOException
-import java.lang.NumberFormatException
 import java.net.InetAddress
 import java.net.NetworkInterface
 import java.net.SocketException
@@ -98,7 +97,7 @@ data class IpNeighbour(val ip: InetAddress, val dev: String, val lladdr: Long, v
                         .filter { it.size >= 6 && mac.matcher(it[ARP_HW_ADDRESS]).matches() }
                         .toList()
             } catch (e: IOException) {
-                if (e !is FileNotFoundException || !BuildCompat.isAtLeastQ() ||
+                if (e !is FileNotFoundException || Build.VERSION.SDK_INT < 29 ||
                         (e.cause as? ErrnoException)?.errno != OsConstants.EACCES) Timber.w(e)
             }
             return arpCache
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiDoubleLock.kt b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiDoubleLock.kt
index 3bb1061e..4ce1be0c 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiDoubleLock.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiDoubleLock.kt
@@ -3,13 +3,13 @@ package be.mygod.vpnhotspot.net.wifi
 import android.annotation.SuppressLint
 import android.content.SharedPreferences
 import android.net.wifi.WifiManager
+import android.os.Build
 import android.os.PowerManager
 import android.view.WindowManager
 import androidx.activity.ComponentActivity
 import androidx.annotation.RequiresApi
 import androidx.core.content.edit
 import androidx.core.content.getSystemService
-import androidx.core.os.BuildCompat
 import androidx.lifecycle.DefaultLifecycleObserver
 import androidx.lifecycle.LifecycleOwner
 import be.mygod.vpnhotspot.App.Companion.app
@@ -23,7 +23,7 @@ class WifiDoubleLock(lockType: Int) : AutoCloseable {
         var mode: Mode
             @Suppress("DEPRECATION")
             get() = Mode.valueOf(app.pref.getString(KEY, Mode.Full.toString()) ?: "").let {
-                if (it == Mode.Full && BuildCompat.isAtLeastQ()) Mode.None else it
+                if (it == Mode.Full && Build.VERSION.SDK_INT >= 29) Mode.None else it
             }
             set(value) = app.pref.edit { putString(KEY, value.toString()) }
         private val service by lazy { app.getSystemService<PowerManager>()!! }
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/configuration/WifiApDialogFragment.kt b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/configuration/WifiApDialogFragment.kt
index 4315d655..54eb2d60 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/configuration/WifiApDialogFragment.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/configuration/WifiApDialogFragment.kt
@@ -15,7 +15,6 @@ import android.widget.AdapterView
 import android.widget.ArrayAdapter
 import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.widget.Toolbar
-import androidx.core.os.BuildCompat
 import androidx.core.view.isGone
 import be.mygod.vpnhotspot.AlertDialogFragment
 import be.mygod.vpnhotspot.App.Companion.app
@@ -27,7 +26,6 @@ import be.mygod.vpnhotspot.util.toParcelable
 import be.mygod.vpnhotspot.widget.SmartSnackbar
 import kotlinx.android.parcel.Parcelize
 import kotlinx.android.synthetic.main.dialog_wifi_ap.view.*
-import java.lang.IllegalStateException
 import java.nio.charset.Charset
 
 /**
@@ -117,7 +115,7 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
             bandOptions = mutableListOf<BandOption>().apply {
                 if (arg.p2pMode) {
                     add(BandOption.BandAny)
-                    if (BuildCompat.isAtLeastQ()) {
+                    if (Build.VERSION.SDK_INT >= 29) {
                         add(BandOption.Band2GHz)
                         add(BandOption.Band5GHz)
                     }
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/util/Utils.kt b/mobile/src/main/java/be/mygod/vpnhotspot/util/Utils.kt
index 45037d7e..02dd7b96 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/util/Utils.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/util/Utils.kt
@@ -14,7 +14,6 @@ import android.view.View
 import android.widget.ImageView
 import androidx.annotation.DrawableRes
 import androidx.core.net.toUri
-import androidx.core.os.BuildCompat
 import androidx.core.view.isVisible
 import androidx.databinding.BindingAdapter
 import be.mygod.vpnhotspot.App.Companion.app
@@ -95,12 +94,12 @@ fun NetworkInterface.formatAddresses(macOnly: Boolean = false) = SpannableString
     }
 }.trimEnd()
 
-private val parseNumericAddress by lazy {
+private val parseNumericAddress by lazy @SuppressLint("SoonBlockedPrivateApi") {
     InetAddress::class.java.getDeclaredMethod("parseNumericAddress", String::class.java).apply {
         isAccessible = true
     }
 }
-fun parseNumericAddress(address: String) = if (BuildCompat.isAtLeastQ())
+fun parseNumericAddress(address: String) = if (Build.VERSION.SDK_INT >= 29)
     InetAddresses.parseNumericAddress(address) else parseNumericAddress.invoke(null, address) as InetAddress
 
 fun Context.launchUrl(url: String) {