diff --git a/app/build.gradle b/app/build.gradle
old mode 100644
new mode 100755
index cba54cd5..819b27ad
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,12 +1,12 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion "25.0.2"
+    compileSdkVersion 27
+    buildToolsVersion '27.0.3'
     defaultConfig {
         applicationId "com.example.android.classicalmusicquiz"
         minSdkVersion 15
-        targetSdkVersion 25
+        targetSdkVersion 27
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
@@ -20,12 +20,13 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
-    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
-    compile 'com.google.android.exoplayer:exoplayer:r2.2.0'
-    compile 'com.android.support:appcompat-v7:25.3.0'
-    testCompile 'junit:junit:4.12'
-    compile 'com.android.support.constraint:constraint-layout:1.0.2'
+    implementation 'com.google.android.exoplayer:exoplayer:2.8.0'
+    //noinspection GradleCompatible
+    implementation 'com.android.support:appcompat-v7:27.1.1'
+    testImplementation 'junit:junit:4.12'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
 }
diff --git a/app/src/main/java/com/example/android/classicalmusicquiz/QuizActivity.java b/app/src/main/java/com/example/android/classicalmusicquiz/QuizActivity.java
old mode 100644
new mode 100755
index 7b4623f8..251d8ac4
--- a/app/src/main/java/com/example/android/classicalmusicquiz/QuizActivity.java
+++ b/app/src/main/java/com/example/android/classicalmusicquiz/QuizActivity.java
@@ -27,12 +27,12 @@
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
+import android.support.v4.app.NotificationCompat;
 import android.support.v4.content.ContextCompat;
 import android.support.v4.media.session.MediaButtonReceiver;
 import android.support.v4.media.session.MediaSessionCompat;
 import android.support.v4.media.session.PlaybackStateCompat;
 import android.support.v7.app.AppCompatActivity;
-import android.support.v7.app.NotificationCompat;
 import android.view.View;
 import android.widget.Button;
 import android.widget.Toast;
@@ -42,6 +42,7 @@
 import com.google.android.exoplayer2.ExoPlayer;
 import com.google.android.exoplayer2.ExoPlayerFactory;
 import com.google.android.exoplayer2.LoadControl;
+import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.SimpleExoPlayer;
 import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.extractor.DefaultExtractorsFactory;
@@ -230,7 +231,7 @@ private void showNotification(PlaybackStateCompat state) {
                 .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
                 .addAction(restartAction)
                 .addAction(playPauseAction)
-                .setStyle(new NotificationCompat.MediaStyle()
+                .setStyle(new android.support.v4.media.app.NotificationCompat.MediaStyle()
                         .setMediaSession(mMediaSession.getSessionToken())
                         .setShowActionsInCompactView(0,1));
 
@@ -370,7 +371,8 @@ protected void onDestroy() {
     // ExoPlayer Event Listeners
 
     @Override
-    public void onTimelineChanged(Timeline timeline, Object manifest) {
+    public void onTimelineChanged(Timeline timeline, Object manifest, int reason) {
+
     }
 
     @Override
@@ -401,12 +403,33 @@ public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
         showNotification(mStateBuilder.build());
     }
 
+    @Override
+    public void onRepeatModeChanged(int repeatMode) {
+
+    }
+
+    @Override
+    public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
+
+    }
+
     @Override
     public void onPlayerError(ExoPlaybackException error) {
     }
 
     @Override
-    public void onPositionDiscontinuity() {
+    public void onPositionDiscontinuity(int reason) {
+
+    }
+
+    @Override
+    public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {
+
+    }
+
+    @Override
+    public void onSeekProcessed() {
+
     }
 
     /**
diff --git a/app/src/main/res/layout/exo_playback_control_view.xml b/app/src/main/res/layout/exo_playback_control_view.xml
old mode 100644
new mode 100755
index b054fe67..0ee47233
--- a/app/src/main/res/layout/exo_playback_control_view.xml
+++ b/app/src/main/res/layout/exo_playback_control_view.xml
@@ -56,7 +56,7 @@
             android:includeFontPadding="false"
             android:textColor="#FFBEBEBE"/>
 
-        <SeekBar android:id="@id/exo_progress"
+        <com.google.android.exoplayer2.ui.DefaultTimeBar android:id="@id/exo_progress"
             android:layout_width="0dp"
             android:layout_weight="1"
             android:layout_height="32dp"
diff --git a/build.gradle b/build.gradle
old mode 100644
new mode 100755
index 1ea4bd05..44bac8f9
--- a/build.gradle
+++ b/build.gradle
@@ -3,9 +3,10 @@
 buildscript {
     repositories {
         jcenter()
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.0'
+        classpath 'com.android.tools.build:gradle:3.1.2'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -15,6 +16,7 @@ buildscript {
 allprojects {
     repositories {
         jcenter()
+        google()
     }
 }
 
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 7aff1511..5afc033d 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Tue Mar 07 11:16:24 PST 2017
+#Fri May 18 11:01:52 CDT 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip