diff --git a/Readme-ja.md b/Readme-ja.md
index 44cd45c..14b152b 100644
--- a/Readme-ja.md
+++ b/Readme-ja.md
@@ -125,4 +125,4 @@ SSLを復号化するには、ローカルプロキシツールのRoot証明書
 ## 開発環境
 
 * JRE(JDK) 1.8以上(Open JDK)
-* AndroidStudio 3.6.1 (https://developer.android.com/studio/index.html)
+* AndroidStudio 2021.1.1 (https://developer.android.com/studio/index.html)
diff --git a/Readme.md b/Readme.md
index 5563c87..d50b399 100644
--- a/Readme.md
+++ b/Readme.md
@@ -121,4 +121,4 @@ Most of the code was created based on the following applications for creating ap
 ## Development environment
 
 * JRE(JDK) 1.8 or later(Open JDK)
-* AndroidStudio 3.6.1 (https://developer.android.com/studio/index.html)
+* AndroidStudio 2021.1.1 (https://developer.android.com/studio/index.html)
diff --git a/android_app/app/build.gradle b/android_app/app/build.gradle
index df2a9b5..fc60e5f 100644
--- a/android_app/app/build.gradle
+++ b/android_app/app/build.gradle
@@ -1,8 +1,8 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 30
-    buildToolsVersion "30.0.3"
+    compileSdkVersion 31
+    buildToolsVersion "31.0.0"
 
     sourceCompatibility = '1.8' // -source
     targetCompatibility = '1.8' // -target
@@ -10,8 +10,8 @@ android {
     defaultConfig {
         applicationId "tun.proxy"
         minSdkVersion 21
-        targetSdkVersion 30
-        versionCode 100260
+        targetSdkVersion 31
+        versionCode 100270
         versionName VERSION_NAME
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         externalNativeBuild {
diff --git a/android_app/app/src/main/AndroidManifest.xml b/android_app/app/src/main/AndroidManifest.xml
index a790a74..67dea71 100644
--- a/android_app/app/src/main/AndroidManifest.xml
+++ b/android_app/app/src/main/AndroidManifest.xml
@@ -18,10 +18,10 @@
         <activity
             android:name=".MainActivity"
             android:label="@string/app_name"
-            android:theme="@style/AppTheme.NoActionBar">
+            android:theme="@style/AppTheme.NoActionBar"
+            android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
@@ -36,7 +36,8 @@
 
         <service
             android:name=".service.Tun2HttpVpnService"
-            android:permission="android.permission.BIND_VPN_SERVICE">
+            android:permission="android.permission.BIND_VPN_SERVICE"
+            android:exported="true">
             <intent-filter>
                 <action android:name="android.net.VpnService" />
             </intent-filter>
@@ -44,7 +45,8 @@
 
         <receiver
             android:name=".receiver.BootReceiver"
-            android:label="@string/app_name">
+            android:label="@string/app_name"
+            android:exported="true">
             <intent-filter android:priority="999">
                 <action android:name="android.intent.action.BOOT_COMPLETED" />
             </intent-filter>
diff --git a/android_app/build.gradle b/android_app/build.gradle
index 11be1a2..7fec861 100644
--- a/android_app/build.gradle
+++ b/android_app/build.gradle
@@ -8,12 +8,8 @@ buildscript {
         
     }
 
-
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.2.2'
-
-        // NOTE: Do not place your application dependencies here; they belong
-        // in the individual module build.gradle files
+        classpath 'com.android.tools.build:gradle:7.0.2'
     }
 }
 
diff --git a/android_app/gradle.properties b/android_app/gradle.properties
index 63fb15f..264a3da 100644
--- a/android_app/gradle.properties
+++ b/android_app/gradle.properties
@@ -19,7 +19,7 @@ android.useAndroidX=true
 android.enableJetifier=true
 
 APP_NAME=TunProxy
-VERSION_NAME=1.2.6
+VERSION_NAME=1.2.7
 
 productKeyStore=../changeit.jks
 productKeyAlias=key0