diff --git a/app/build.gradle b/app/build.gradle
index 2b798207..19ecd5ad 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -13,13 +13,13 @@ ext {
 }
 
 android {
-    compileSdkVersion 26
-    buildToolsVersion "26.0.0"
+    compileSdkVersion 27
+    buildToolsVersion "27.0.1"
 
     defaultConfig {
         applicationId "com.afwsamples.testdpc"
         minSdkVersion 21
-        targetSdkVersion 26
+        targetSdkVersion 27
         versionCode versionMajor * 1000 + versionMinor * 100 + versionBuild
         versionName "${versionMajor}.${versionMinor}.${versionBuild}"
     }
@@ -66,9 +66,9 @@ android {
 }
 
 dependencies {
-    compile 'com.android.support:preference-v14:26.0.0'
-    compile 'com.android.support:recyclerview-v7:26.0.0'
-    compile 'com.android.support:support-v13:26.0.0'
+    compile 'com.android.support:preference-v14:27.0.2'
+    compile 'com.android.support:recyclerview-v7:27.0.2'
+    compile 'com.android.support:support-v13:27.0.2'
     compile 'com.google.android.gms:play-services-safetynet:+'
     compile(name:'setup-wizard-lib-platform-release', ext:'aar')
 }
diff --git a/app/src/main/java/com/afwsamples/testdpc/DeviceAdminReceiver.java b/app/src/main/java/com/afwsamples/testdpc/DeviceAdminReceiver.java
index 2840dcee..d384bb8a 100644
--- a/app/src/main/java/com/afwsamples/testdpc/DeviceAdminReceiver.java
+++ b/app/src/main/java/com/afwsamples/testdpc/DeviceAdminReceiver.java
@@ -17,7 +17,6 @@
 package com.afwsamples.testdpc;
 
 import android.annotation.TargetApi;
-import android.app.Notification;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.app.admin.DevicePolicyManager;
@@ -33,13 +32,12 @@
 import android.os.UserHandle;
 import android.os.UserManager;
 import android.preference.PreferenceManager;
-import android.support.v7.app.NotificationCompat;
+import android.support.v4.app.NotificationCompat;
 import android.text.TextUtils;
 import android.util.Log;
 import android.widget.Toast;
 
 import com.afwsamples.testdpc.common.NotificationUtil;
-import com.afwsamples.testdpc.common.Util;
 import com.afwsamples.testdpc.provision.PostProvisioningTask;
 
 import java.io.BufferedReader;
diff --git a/app/src/main/java/com/afwsamples/testdpc/PackageMonitorReceiver.java b/app/src/main/java/com/afwsamples/testdpc/PackageMonitorReceiver.java
index b175056d..6d6e35b4 100644
--- a/app/src/main/java/com/afwsamples/testdpc/PackageMonitorReceiver.java
+++ b/app/src/main/java/com/afwsamples/testdpc/PackageMonitorReceiver.java
@@ -5,9 +5,9 @@
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
-import android.support.v7.app.NotificationCompat;
-import android.support.v7.app.NotificationCompat.Builder;
+import android.support.v4.app.NotificationCompat;
 import android.text.TextUtils;
+
 import com.afwsamples.testdpc.common.NotificationUtil;
 
 public class PackageMonitorReceiver extends BroadcastReceiver {
diff --git a/app/src/main/java/com/afwsamples/testdpc/common/NotificationUtil.java b/app/src/main/java/com/afwsamples/testdpc/common/NotificationUtil.java
index 63845852..1ce37d9c 100644
--- a/app/src/main/java/com/afwsamples/testdpc/common/NotificationUtil.java
+++ b/app/src/main/java/com/afwsamples/testdpc/common/NotificationUtil.java
@@ -8,7 +8,7 @@
 import android.support.annotation.RequiresApi;
 import android.support.annotation.StringRes;
 import android.support.v4.os.BuildCompat;
-import android.support.v7.app.NotificationCompat;
+import android.support.v4.app.NotificationCompat;
 
 import com.afwsamples.testdpc.R;
 
@@ -37,8 +37,8 @@ public static NotificationCompat.Builder getNotificationBuilder(Context context)
         if (BuildCompat.isAtLeastO()) {
             createDefaultNotificationChannel(context);
         }
-        NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
-        builder.setChannelId(DEFAULT_CHANNEL_ID);
+        NotificationCompat.Builder builder
+                = new NotificationCompat.Builder(context, DEFAULT_CHANNEL_ID);
         return builder;
     }
 
diff --git a/app/src/main/java/com/afwsamples/testdpc/common/Util.java b/app/src/main/java/com/afwsamples/testdpc/common/Util.java
index d4b74d25..0ebd9e80 100644
--- a/app/src/main/java/com/afwsamples/testdpc/common/Util.java
+++ b/app/src/main/java/com/afwsamples/testdpc/common/Util.java
@@ -17,9 +17,6 @@
 package com.afwsamples.testdpc.common;
 
 import android.annotation.TargetApi;
-import android.app.Notification;
-import android.app.NotificationChannel;
-import android.app.NotificationManager;
 import android.app.Service;
 import android.app.admin.DevicePolicyManager;
 import android.content.ActivityNotFoundException;
@@ -33,10 +30,8 @@
 import android.os.Bundle;
 import android.os.UserHandle;
 import android.os.UserManager;
-import android.support.annotation.RequiresApi;
 import android.support.v14.preference.PreferenceFragment;
 import android.support.v4.os.BuildCompat;
-import android.support.v7.app.NotificationCompat;
 import android.text.format.DateUtils;
 import android.util.Log;
 import android.widget.ImageView;