diff --git a/build.gradle b/build.gradle
index 9478026..78d28a3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,7 +10,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.2.1'
+        classpath 'com.android.tools.build:gradle:4.2.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath 'com.github.dcendents:android-maven-gradle-plugin:2.1'
     }
@@ -18,7 +18,7 @@ buildscript {
 
 ext {
     versions = [
-            compileSdk: 28,
+            compileSdk: 30,
             minSdk    : 19
     ]
 }
diff --git a/samples/app/build.gradle b/samples/app/build.gradle
index 86b57ff..36df361 100644
--- a/samples/app/build.gradle
+++ b/samples/app/build.gradle
@@ -12,11 +12,11 @@ android {
         }
     }
 
-    compileSdkVersion 29
+    compileSdkVersion versions.compileSdk
     defaultConfig {
         applicationId "nolambda.linkrouter.samples"
         minSdkVersion 21
-        targetSdkVersion 29
+        targetSdkVersion versions.compileSdk
         versionCode 1
         versionName "1.0"
 
diff --git a/samples/app/src/main/java/nolambda/linkrouter/examples/SampleApp.kt b/samples/app/src/main/java/nolambda/linkrouter/examples/SampleApp.kt
index debceca..78c36ee 100644
--- a/samples/app/src/main/java/nolambda/linkrouter/examples/SampleApp.kt
+++ b/samples/app/src/main/java/nolambda/linkrouter/examples/SampleApp.kt
@@ -3,8 +3,6 @@ package nolambda.linkrouter.examples
 import android.app.Application
 import android.util.Log
 import nolambda.linkrouter.android.RouterPlugin
-import nolambda.linkrouter.approuter.AppRouter
-import nolambda.linkrouter.approuter.AppRoutes
 
 class SampleApp : Application() {
     override fun onCreate() {
diff --git a/samples/approuter/build.gradle b/samples/approuter/build.gradle
index 89a7e82..3d6bcba 100644
--- a/samples/approuter/build.gradle
+++ b/samples/approuter/build.gradle
@@ -2,13 +2,11 @@ apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 android {
-    compileSdkVersion 29
-    buildToolsVersion "29.0.2"
-
+    compileSdkVersion versions.compileSdk
 
     defaultConfig {
         minSdkVersion 21
-        targetSdkVersion 29
+        targetSdkVersion versions.compileSdk
         versionCode 1
         versionName "1.0"
 
diff --git a/samples/cart/build.gradle b/samples/cart/build.gradle
index 8e6f52b..25994db 100644
--- a/samples/cart/build.gradle
+++ b/samples/cart/build.gradle
@@ -2,13 +2,11 @@ apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 android {
-    compileSdkVersion 29
-    buildToolsVersion "29.0.2"
-
+    compileSdkVersion versions.compileSdk
 
     defaultConfig {
         minSdkVersion 21
-        targetSdkVersion 29
+        targetSdkVersion versions.compileSdk
         versionCode 1
         versionName "1.0"
 
diff --git a/samples/product/build.gradle b/samples/product/build.gradle
index a14f365..7a3b561 100644
--- a/samples/product/build.gradle
+++ b/samples/product/build.gradle
@@ -4,13 +4,11 @@ apply plugin: 'kotlin-android-extensions'
 apply plugin: 'kotlin-kapt'
 
 android {
-    compileSdkVersion 29
-    buildToolsVersion "29.0.2"
-
+    compileSdkVersion versions.compileSdk
 
     defaultConfig {
         minSdkVersion 21
-        targetSdkVersion 29
+        targetSdkVersion versions.compileSdk
         versionCode 1
         versionName "1.0"