diff --git a/README.md b/README.md
index 376431b..ab4ba9c 100644
--- a/README.md
+++ b/README.md
@@ -30,13 +30,13 @@ Features:
 
 __Users must comply with local laws and regulations.__<br>
 
-DNS server providers
+DNS Server Providers
 -------------
 * __CuteDNS__ - *Restart service recently.*
 * __[Pure DNS](http://puredns.cn/)__ - *I DO NOT KNOW HOW TO DESCRIBE~~~*
 * __[AIXYZ DNS](https://aixyz.com/)__ - __*For academic purposes only.*__
 
-Rule providers
+Rule Providers
 -------------
 * __[hosts](https://github.com/racaljk/hosts)__ by *[Cthulhu](https://github.com/racaljk)* - [CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/deed.zh)
 * __[google-hosts](https://github.com/fengixng/google-hosts)__ by *[fengixng](https://github.com/fengixng)* - None
diff --git a/app/src/main/java/org/itxtech/daedalus/fragment/DnsTestFragment.java b/app/src/main/java/org/itxtech/daedalus/fragment/DnsTestFragment.java
index 3373c42..e0d551a 100644
--- a/app/src/main/java/org/itxtech/daedalus/fragment/DnsTestFragment.java
+++ b/app/src/main/java/org/itxtech/daedalus/fragment/DnsTestFragment.java
@@ -15,8 +15,8 @@ import de.measite.minidns.DNSMessage;
 import de.measite.minidns.Question;
 import de.measite.minidns.Record;
 import de.measite.minidns.record.A;
+import de.measite.minidns.record.InternetAddressRR;
 import de.measite.minidns.source.NetworkDataSource;
-import de.measite.minidns.util.InetAddressUtil;
 import org.itxtech.daedalus.Daedalus;
 import org.itxtech.daedalus.R;
 import org.itxtech.daedalus.util.DnsServerHelper;
@@ -103,13 +103,13 @@ public class DnsTestFragment extends ToolbarFragment {
 
                 try {
                     long startTime = System.currentTimeMillis();
-                    DNSMessage responseMessage = dnsQuery.query(message.build(), InetAddressUtil.ipv4From(dnsServer), 53);//Auto forward ports
+                    DNSMessage responseMessage = dnsQuery.query(message.build(), InetAddress.getByName(dnsServer), 53);//Auto forward ports
                     long endTime = System.currentTimeMillis();
 
-                    Set<A> answers = responseMessage.getAnswersFor(question);
+                    Set<InternetAddressRR> answers = responseMessage.getAnswersFor(question);
                     if (answers != null && answers.size() > 0) {
-                        for (A a : answers) {
-                            InetAddress inetAddress = a.getInetAddress();
+                        for (InternetAddressRR answer : answers) {
+                            InetAddress inetAddress = answer.getInetAddress();
                             testText.append("\n").append(getResources().getString(R.string.test_result_resolved)).append(" ").append(inetAddress.getHostAddress());
                         }
                         testText.append("\n").append(getResources().getString(R.string.test_time_used)).append(" ").
diff --git a/app/src/main/java/org/itxtech/daedalus/provider/UdpDnsProvider.java b/app/src/main/java/org/itxtech/daedalus/provider/UdpDnsProvider.java
index 996041c..7af8331 100644
--- a/app/src/main/java/org/itxtech/daedalus/provider/UdpDnsProvider.java
+++ b/app/src/main/java/org/itxtech/daedalus/provider/UdpDnsProvider.java
@@ -345,8 +345,8 @@ public class UdpDnsProvider extends DnsProvider {
         String dnsQueryName = dnsMsg.getQuestion().name.toString();
 
         try {
-            String response;
-            if ((response = RulesResolver.resolve(dnsQueryName)) != null) {
+            String response = RulesResolver.resolve(dnsQueryName);
+            if (response != null) {
                 Logger.info("DnsProvider: Resolved " + dnsQueryName + "  Local resolver response: " + response);
                 DNSMessage.Builder builder = dnsMsg.asBuilder();
                 int[] ip = new int[4];
diff --git a/app/src/main/java/org/itxtech/daedalus/service/DaedalusVpnService.java b/app/src/main/java/org/itxtech/daedalus/service/DaedalusVpnService.java
index 8d246a6..1c1327b 100644
--- a/app/src/main/java/org/itxtech/daedalus/service/DaedalusVpnService.java
+++ b/app/src/main/java/org/itxtech/daedalus/service/DaedalusVpnService.java
@@ -11,7 +11,6 @@ import android.os.Build;
 import android.os.ParcelFileDescriptor;
 import android.support.v7.app.NotificationCompat;
 import android.util.Log;
-import de.measite.minidns.util.InetAddressUtil;
 import org.itxtech.daedalus.Daedalus;
 import org.itxtech.daedalus.R;
 import org.itxtech.daedalus.activity.MainActivity;
@@ -23,7 +22,7 @@ import org.itxtech.daedalus.util.DnsServerHelper;
 import org.itxtech.daedalus.util.Logger;
 import org.itxtech.daedalus.util.RulesResolver;
 
-import java.net.Inet4Address;
+import java.net.InetAddress;
 import java.util.HashMap;
 
 /**
@@ -210,8 +209,8 @@ public class DaedalusVpnService extends VpnService implements Runnable {
                 aliasSecondary = secondaryServer;
             }
 
-            Inet4Address primaryDNSServer = InetAddressUtil.ipv4From(aliasPrimary);
-            Inet4Address secondaryDNSServer = InetAddressUtil.ipv4From(aliasSecondary);
+            InetAddress primaryDNSServer = InetAddress.getByName(aliasPrimary);
+            InetAddress secondaryDNSServer = InetAddress.getByName(aliasSecondary);
             Logger.info("Daedalus VPN service is listening on " + primaryDNSServer.getHostAddress() + " and " + secondaryDNSServer.getHostAddress());
             builder.setSession("Daedalus")
                     .addDnsServer(primaryDNSServer)