diff --git a/build.gradle b/build.gradle
index 1139f871..3fd08352 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,7 +7,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.1.2'
+        classpath 'com.android.tools.build:gradle:4.1.3'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/gen-libs/build.gradle b/gen-libs/build.gradle
deleted file mode 100644
index 73360ed7..00000000
--- a/gen-libs/build.gradle
+++ /dev/null
@@ -1,39 +0,0 @@
-apply plugin: 'com.android.library'
-
-android {
-    compileSdkVersion 25
-
-    defaultConfig {
-        minSdkVersion 21
-        targetSdkVersion 25
-        versionCode 1
-        versionName "1.0"
-
-        externalNativeBuild {
-            cmake {
-                arguments '-DANDROID_PLATFORM=android-21',
-                          '-DANDROID_TOOLCHAIN=clang'
-                // explicitly build libs
-                // targets 're', 'rem', 'baresip'
-            }
-           
-        }
-    }
-    buildTypes {
-        release {
-            minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android.txt'),
-                          'proguard-rules.pro'
-        }
-    }
-    externalNativeBuild {
-        cmake {
-            path 'src/main/cpp/CMakeLists.txt'
-        }
-    }
-}
-
-dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:appcompat-v7:25.2.0'
-}
diff --git a/gen-libs/proguard-rules.pro b/gen-libs/proguard-rules.pro
deleted file mode 100644
index b7420a70..00000000
--- a/gen-libs/proguard-rules.pro
+++ /dev/null
@@ -1,17 +0,0 @@
-# Add project specific ProGuard rules here.
-# By default, the flags in this file are appended to flags specified
-# in /Users/gfan/dev/sdk_current/tools/proguard/proguard-android.txt
-# You can edit the include path and order by changing the proguardFiles
-# directive in build.gradle.
-#
-# For more details, see
-#   http://developer.android.com/guide/developing/tools/proguard.html
-
-# Add any project specific keep options here:
-
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-#   public *;
-#}
diff --git a/gen-libs/src/main/AndroidManifest.xml b/gen-libs/src/main/AndroidManifest.xml
deleted file mode 100644
index 558514ef..00000000
--- a/gen-libs/src/main/AndroidManifest.xml
+++ /dev/null
@@ -1,9 +0,0 @@
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.tutpro.buildlibs">
-
-    <application android:allowBackup="true" android:label="@string/app_name"
-        android:supportsRtl="true">
-
-    </application>
-
-</manifest>
diff --git a/gen-libs/src/main/res/values/strings.xml b/gen-libs/src/main/res/values/strings.xml
deleted file mode 100644
index a763d348..00000000
--- a/gen-libs/src/main/res/values/strings.xml
+++ /dev/null
@@ -1,3 +0,0 @@
-<resources>
-    <string name="app_name">BuildLibs</string>
-</resources>