diff --git a/build.gradle b/build.gradle
index 91fcd0d..4c40495 100644
--- a/build.gradle
+++ b/build.gradle
@@ -17,34 +17,35 @@
 
 buildscript {
     repositories {
+        google()
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.3'
+        classpath 'com.android.tools.build:gradle:3.3.0-alpha11'
     }
 }
 apply plugin: 'com.android.library'
 
 repositories {
+    google()
     jcenter()
 }
 
 dependencies {
-    compile 'com.android.support:support-v4:21.+'
-    compile 'com.google.protobuf:protobuf-java:3.0.0'
-    compile 'com.madgag.spongycastle:core:1.51.0.0'
+    implementation 'com.android.support:support-v4:21.+'
+    implementation 'com.google.protobuf:protobuf-java:3.0.0'
 
+    api 'com.madgag.spongycastle:core:1.51.0.0'
     // Custom PKCS12 keybag parse modifications to support Mumble unencrypted certificates
     // Source: https://github.com/Morlunk/spongycastle/tree/pkcs12-keybag-fixes
-    compile files('libs/sc-morlunk-prov-1.51.0.0.jar', 'libs/sc-morlunk-pkix-1.51.0.0.jar')
+    api files('libs/sc-morlunk-prov-1.51.0.0.jar', 'libs/sc-morlunk-pkix-1.51.0.0.jar')
 
-    compile 'com.googlecode.javacpp:javacpp:0.7'
-    compile 'com.intellij:annotations:+@jar'
+    implementation 'com.googlecode.javacpp:javacpp:0.7'
+    implementation 'com.intellij:annotations:+@jar'
 }
 
 android {
-    compileSdkVersion 21
-    buildToolsVersion "21.1.1"
+    compileSdkVersion 28
 
     sourceSets.main.jniLibs.srcDir 'src/main/libs/'
     sourceSets.main.jni.srcDirs = [] // Disable NDK build support until it supports multiple modules.
@@ -53,18 +54,19 @@ android {
         testApplicationId "com.morlunk.jumble.test"
         testInstrumentationRunner "android.test.InstrumentationTestRunner"
         minSdkVersion 9
-        targetSdkVersion 19
+        targetSdkVersion 28
 
-//        ndk {
-//            abiFilters "armeabi", "armeabi-v7a", "x86"
-//            stl "gnustl_static"
-//            cFlags "-I\$(LOCAL_PATH)/speex/include/ -I\$(LOCAL_PATH)/celt-0.11.0-src/include/ -I\$(LOCAL_PATH)/celt-0.7.0-src/include/ -I\$(LOCAL_PATH)/opus/include -D__EMX__ -DUSE_KISS_FFT -DFIXED_POINT -DEXPORT='' -DHAVE_CONFIG_H -fvisibility=hidden -DOPUS_BUILD -DVAR_ARRAYS -Wno-traditional -DFIXED_POINT"
-//        }
+       ndk {
+           abiFilters "armeabi-v7a", "arm64-v8a", "x86", "x86_64"
+           stl "gnustl_static"
+           cFlags "-I\$(LOCAL_PATH)/speex/include/ -I\$(LOCAL_PATH)/celt-0.11.0-src/include/ -I\$(LOCAL_PATH)/celt-0.7.0-src/include/ -I\$(LOCAL_PATH)/opus/include -D__EMX__ -DUSE_KISS_FFT -DFIXED_POINT -DEXPORT='' -DHAVE_CONFIG_H -fvisibility=hidden -DOPUS_BUILD -DVAR_ARRAYS -Wno-traditional -DFIXED_POINT"
+       }
     }
 
     // Trigger NDK build on java compilation task.
     task ndkBuild(type: Exec) {
-        commandLine 'ndk-build', '-C', file('src/main/jni/').absolutePath
+        def ndkDir = project.android.ndkDirectory
+        commandLine "$ndkDir/ndk-build", '-C', file('src/main/jni/').absolutePath
     }
 
     tasks.withType(JavaCompile) {
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 1e61d1f..a7c872c 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=http\://services.gradle.org/distributions/gradle-1.12-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10-all.zip
diff --git a/src/main/java/com/morlunk/jumble/util/JumbleException.java b/src/main/java/com/morlunk/jumble/util/JumbleException.java
index 5d0a7d1..f423456 100644
--- a/src/main/java/com/morlunk/jumble/util/JumbleException.java
+++ b/src/main/java/com/morlunk/jumble/util/JumbleException.java
@@ -87,6 +87,11 @@ public Mumble.Reject getReject() {
         return mReject;
     }
 
+    public boolean isAuthenticationFailure() {
+        return getReject().getType() == Mumble.Reject.RejectType.WrongUserPW ||
+                getReject().getType() == Mumble.Reject.RejectType.WrongServerPW;
+    }
+
     public Mumble.UserRemove getUserRemove() {
         return mUserRemove;
     }
diff --git a/src/main/jni/Application.mk b/src/main/jni/Application.mk
index d7d1872..5f3a2d4 100644
--- a/src/main/jni/Application.mk
+++ b/src/main/jni/Application.mk
@@ -1,3 +1,3 @@
 #APP_OPTIM := debug
-APP_ABI := armeabi-v7a armeabi x86
-APP_STL := gnustl_static
\ No newline at end of file
+APP_ABI := armeabi-v7a arm64-v8a x86 x86_64
+APP_STL := c++_static
\ No newline at end of file