diff --git a/app/build.gradle b/app/build.gradle
index d831a06..8d772d0 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -10,7 +10,7 @@ android {
         minSdkVersion 15
         targetSdkVersion 25
         versionCode 2
-        versionName "1.0.1"
+        versionName "1.1.0"
 
         buildConfigField "String", "BUILD_TIME", "\"${System.currentTimeMillis()}\""
         buildConfigField "String", "GIT_COMMIT", "\"${gitCommit}\""
diff --git a/app/src/main/java/org/itxtech/daedalus/fragment/SettingsFragment.java b/app/src/main/java/org/itxtech/daedalus/fragment/SettingsFragment.java
index d91a5a8..8c3d700 100644
--- a/app/src/main/java/org/itxtech/daedalus/fragment/SettingsFragment.java
+++ b/app/src/main/java/org/itxtech/daedalus/fragment/SettingsFragment.java
@@ -41,7 +41,7 @@ public class SettingsFragment extends PreferenceFragment {
         secondaryServer.setEntries(DnsServer.getDnsServerNames(Daedalus.getInstance()));
         secondaryServer.setEntryValues(DnsServer.getDnsServerIds());
 
-        if (Build.VERSION.SDK_INT < 21) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
             SwitchPreference countQueryTimes = (SwitchPreference) findPreference("settings_count_query_times");
             countQueryTimes.setChecked(false);
             countQueryTimes.setEnabled(false);
@@ -69,7 +69,7 @@ public class SettingsFragment extends PreferenceFragment {
     @Override
     public void onStart() {
         super.onStart();
-        if (view != null && Build.VERSION.SDK_INT < 21) {
+        if (view != null && Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
             Snackbar.make(view, R.string.notice_legacy_api, Snackbar.LENGTH_LONG)
                     .setAction("Action", null).show();
         }
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 a27e3af..5377128 100644
--- a/app/src/main/java/org/itxtech/daedalus/service/DaedalusVpnService.java
+++ b/app/src/main/java/org/itxtech/daedalus/service/DaedalusVpnService.java
@@ -1,11 +1,13 @@
 package org.itxtech.daedalus.service;
 
+import android.annotation.TargetApi;
 import android.app.Notification;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.content.Context;
 import android.content.Intent;
 import android.net.VpnService;
+import android.os.Build;
 import android.os.ParcelFileDescriptor;
 import android.preference.PreferenceManager;
 import android.support.v7.app.NotificationCompat;
@@ -134,6 +136,7 @@ public class DaedalusVpnService extends VpnService implements Runnable {
         stopThread();
     }
 
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     private void stopThread() {
         try {
             if (this.descriptor != null) {
@@ -167,6 +170,7 @@ public class DaedalusVpnService extends VpnService implements Runnable {
         stopThread();
     }
 
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     @Override
     public void run() {
         try {