diff --git a/build.gradle.kts b/build.gradle.kts
index 657363fe..9a4b13e0 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -9,9 +9,9 @@ buildscript {
     }
 
     dependencies {
-        classpath(kotlin("gradle-plugin", "1.5.10"))
-        classpath("com.android.tools.build:gradle:7.0.0-beta03")
-        classpath("com.google.firebase:firebase-crashlytics-gradle:2.7.0")
+        classpath(kotlin("gradle-plugin", "1.5.20"))
+        classpath("com.android.tools.build:gradle:7.0.0-beta05")
+        classpath("com.google.firebase:firebase-crashlytics-gradle:2.7.1")
         classpath("com.google.android.gms:oss-licenses-plugin:0.10.4")
         classpath("com.google.gms:google-services:4.3.8")
     }
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index e708b1c0..7454180f 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 0f80bbf5..05679dc3 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.1.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
index 4f906e0c..744e882e 100755
--- a/gradlew
+++ b/gradlew
@@ -72,7 +72,7 @@ case "`uname`" in
   Darwin* )
     darwin=true
     ;;
-  MINGW* )
+  MSYS* | MINGW* )
     msys=true
     ;;
   NONSTOP* )
diff --git a/mobile/build.gradle.kts b/mobile/build.gradle.kts
index 14fdaf88..836bce8e 100644
--- a/mobile/build.gradle.kts
+++ b/mobile/build.gradle.kts
@@ -72,9 +72,9 @@ dependencies {
     implementation(kotlin("stdlib-jdk8"))
     implementation("androidx.appcompat:appcompat:1.3.0")    // https://issuetracker.google.com/issues/151603528
     implementation("androidx.browser:browser:1.3.0")
-    implementation("androidx.core:core-ktx:1.6.0-beta02")
+    implementation("androidx.core:core-ktx:1.6.0")
     implementation("androidx.emoji:emoji:1.1.0")
-    implementation("androidx.fragment:fragment-ktx:1.3.4")
+    implementation("androidx.fragment:fragment-ktx:1.3.5")
     implementation("androidx.lifecycle:lifecycle-common-java8:$lifecycleVersion")
     implementation("androidx.lifecycle:lifecycle-livedata-ktx:$lifecycleVersion")
     implementation("androidx.lifecycle:lifecycle-runtime-ktx:$lifecycleVersion")
@@ -83,18 +83,18 @@ dependencies {
     implementation("androidx.swiperefreshlayout:swiperefreshlayout:1.1.0")
     implementation("com.android.billingclient:billing-ktx:4.0.0")
     implementation("com.google.android.gms:play-services-oss-licenses:17.0.0")
-    implementation("com.google.android.material:material:1.4.0-rc01")
+    implementation("com.google.android.material:material:1.4.0")
     implementation("com.google.firebase:firebase-analytics-ktx:19.0.0")
-    implementation("com.google.firebase:firebase-crashlytics:18.0.1")
+    implementation("com.google.firebase:firebase-crashlytics:18.1.0")
     implementation("com.google.zxing:core:3.4.1")
     implementation("com.jakewharton.timber:timber:4.7.1")
     implementation("com.linkedin.dexmaker:dexmaker:2.28.1")
     implementation("com.takisoft.preferencex:preferencex-simplemenu:1.1.0")
     implementation("org.jetbrains.kotlinx:kotlinx-collections-immutable:0.3.4")
-    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.0")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.1")
     testImplementation("junit:junit:4.13.2")
     androidTestImplementation("androidx.room:room-testing:$roomVersion")
-    androidTestImplementation("androidx.test:runner:1.3.0")
-    androidTestImplementation("androidx.test.espresso:espresso-core:3.3.0")
-    androidTestImplementation("androidx.test.ext:junit-ktx:1.1.2")
+    androidTestImplementation("androidx.test:runner:1.4.0")
+    androidTestImplementation("androidx.test.espresso:espresso-core:3.4.0")
+    androidTestImplementation("androidx.test.ext:junit-ktx:1.1.3")
 }
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt b/mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt
index e7f03c16..bf2950bb 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt
@@ -479,17 +479,19 @@ class RepeaterService : Service(), CoroutineScope, WifiP2pManager.ChannelListene
     private fun showNotification(group: WifiP2pGroup? = null) = ServiceNotification.startForeground(this,
             if (group == null) emptyMap() else mapOf(Pair(group.`interface`, group.clientList?.size ?: 0)))
 
-    private fun removeGroup() = p2pManager.removeGroup(channel, object : WifiP2pManager.ActionListener {
-        override fun onSuccess() {
-            launch { cleanLocked() }
-        }
-        override fun onFailure(reason: Int) {
-            if (reason != WifiP2pManager.BUSY) {
-                SmartSnackbar.make(formatReason(R.string.repeater_remove_group_failure, reason)).show()
-            }   // else assuming it's already gone
-            onSuccess()
-        }
-    })
+    private fun removeGroup() {
+        p2pManager.removeGroup(channel ?: return, object : WifiP2pManager.ActionListener {
+            override fun onSuccess() {
+                launch { cleanLocked() }
+            }
+            override fun onFailure(reason: Int) {
+                if (reason != WifiP2pManager.BUSY) {
+                    SmartSnackbar.make(formatReason(R.string.repeater_remove_group_failure, reason)).show()
+                }   // else assuming it's already gone
+                onSuccess()
+            }
+        })
+    }
     private fun cleanLocked() {
         if (receiverRegistered) {
             ensureReceiverUnregistered(receiver)
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiApDialogFragment.kt b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiApDialogFragment.kt
index 02db97d3..db3bf1b7 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiApDialogFragment.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiApDialogFragment.kt
@@ -389,7 +389,7 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
                     }
                 }
                 true
-            } catch (e: IllegalArgumentException) {
+            } catch (e: RuntimeException) {
                 SmartSnackbar.make(e).show()
                 false
             }
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiApManager.kt b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiApManager.kt
index 9c4cbd37..5bef6e2d 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiApManager.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiApManager.kt
@@ -326,6 +326,10 @@ object WifiApManager {
     private val cancelLocalOnlyHotspotRequest by lazy {
         WifiManager::class.java.getDeclaredMethod("cancelLocalOnlyHotspotRequest")
     }
+    /**
+     * This is the only way to unregister requests besides app exiting.
+     * Therefore, we are happy with crashing the app if reflection fails.
+     */
     @RequiresApi(26)
     fun cancelLocalOnlyHotspotRequest() = cancelLocalOnlyHotspotRequest(Services.wifi)
 
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/root/MiscCommands.kt b/mobile/src/main/java/be/mygod/vpnhotspot/root/MiscCommands.kt
index 7f588c79..e1714073 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/root/MiscCommands.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/root/MiscCommands.kt
@@ -213,8 +213,8 @@ data class SettingsGlobalPut(val name: String, val value: String) : RootCommandN
     override suspend fun execute() = withContext(Dispatchers.IO) {
         val process = ProcessBuilder("settings", "put", "global", name, value).fixPath(true).start()
         val error = process.inputStream.bufferedReader().readText()
-        check(process.waitFor() == 0)
-        if (error.isNotEmpty()) throw RemoteException(error)
+        val exit = process.waitFor()
+        if (exit != 0 || error.isNotEmpty()) throw RemoteException("Process exited with $exit: $error")
         null
     }
 }
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 7e6e3ab9..5b6d4049 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/util/Utils.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/util/Utils.kt
@@ -213,10 +213,14 @@ private val newLookup by lazy @TargetApi(26) {
  * See also: https://stackoverflow.com/a/49532463/2245107
  */
 fun InvocationHandler.callSuper(interfaceClass: Class<*>, proxy: Any, method: Method, args: Array<out Any?>?) = when {
-    Build.VERSION.SDK_INT >= 26 && method.isDefault -> newLookup.newInstance(interfaceClass, 0xf)   // ALL_MODES
-            .`in`(interfaceClass).unreflectSpecial(method, interfaceClass).bindTo(proxy).run {
-                if (args == null) invokeWithArguments() else invokeWithArguments(*args)
-            }
+    Build.VERSION.SDK_INT >= 26 && method.isDefault -> try {
+        newLookup.newInstance(interfaceClass, 0xf)   // ALL_MODES
+    } catch (e: ReflectiveOperationException) {
+        Timber.w(e)
+        MethodHandles.lookup().`in`(interfaceClass)
+    }.unreflectSpecial(method, interfaceClass).bindTo(proxy).run {
+        if (args == null) invokeWithArguments() else invokeWithArguments(*args)
+    }
     // otherwise, we just redispatch it to InvocationHandler
     method.declaringClass.isAssignableFrom(javaClass) -> when {
         method.declaringClass == Object::class.java -> when (method.name) {