diff --git a/android/app/build.gradle b/android/app/build.gradle
index ed262a6..f55469f 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -29,58 +29,54 @@ if (keystorePropertiesFile.exists()) {
 }
 
 android {
-    namespace 'com.yoshi.rain'
-    compileSdkVersion 34
-    ndkVersion flutter.ndkVersion
+    namespace = 'com.yoshi.rain'
+    compileSdk = 34
+    ndkVersion = flutter.ndkVersion
 
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_8
-        targetCompatibility JavaVersion.VERSION_1_8
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
     }
 
     kotlinOptions {
-        jvmTarget = '1.8'
-    }
-
-    sourceSets {
-        main.java.srcDirs += 'src/main/kotlin'
+        jvmTarget = JavaVersion.VERSION_17
     }
 
     defaultConfig {
-        applicationId "com.yoshi.rain"
-        minSdkVersion 23
-        targetSdkVersion flutter.targetSdkVersion
-        versionCode flutterVersionCode.toInteger()
-        versionName flutterVersionName
+        applicationId = 'com.yoshi.rain'
+        minSdk = 23
+        targetSdk = flutter.targetSdkVersion
+        versionCode = flutter.versionCode
+        versionName = flutter.versionName
     }
 
     signingConfigs {
-       release {
-           keyAlias keystoreProperties['keyAlias']
-           keyPassword keystoreProperties['keyPassword']
-           storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
-           storePassword keystoreProperties['storePassword']
+        release {
+            keyAlias = keystoreProperties['keyAlias']
+            keyPassword = keystoreProperties['keyPassword']
+            storeFile = keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
+            storePassword = keystoreProperties['storePassword']
         }
     }
 
     buildTypes {
         release {
-           signingConfig signingConfigs.release
+           signingConfig = signingConfigs.release
         }
 
         debug {
-            signingConfig signingConfigs.debug
-            minifyEnabled true
+            signingConfig = signingConfigs.debug
+            minifyEnabled = true
         }
     }
 
     buildFeatures {
-        viewBinding true
+        viewBinding = true
     }
 }
 
 flutter {
-    source '../..'
+    source = '../..'
 }
 
 dependencies {