diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 391a647..9c5e33d 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -19,8 +19,6 @@ val gVersionName: String by rootExtra
 
 val gKotlinVersion: String by rootExtra
 val gKotlinCoroutineVersion: String by rootExtra
-val gKotlinSerializationVersion: String by rootExtra
-val gRoomVersion: String by rootExtra
 val gAppCenterVersion: String by rootExtra
 val gAndroidKtxVersion: String by rootExtra
 val gLifecycleVersion: String by rootExtra
diff --git a/core/build.gradle.kts b/core/build.gradle.kts
index badb851..1369ced 100644
--- a/core/build.gradle.kts
+++ b/core/build.gradle.kts
@@ -21,15 +21,7 @@ val gVersionName: String by rootExtra
 val gKotlinVersion: String by rootExtra
 val gKotlinCoroutineVersion: String by rootExtra
 val gKotlinSerializationVersion: String by rootExtra
-val gRoomVersion: String by rootExtra
-val gAppCenterVersion: String by rootExtra
 val gAndroidKtxVersion: String by rootExtra
-val gLifecycleVersion: String by rootExtra
-val gRecyclerviewVersion: String by rootExtra
-val gAppCompatVersion: String by rootExtra
-val gMaterialDesignVersion: String by rootExtra
-val gShizukuPreferenceVersion: String by rootExtra
-val gMultiprocessPreferenceVersion: String by rootExtra
 
 val clashCoreOutput = buildDir.resolve("extraSources")
 
diff --git a/design/build.gradle.kts b/design/build.gradle.kts
index c7f7e90..d38a7e3 100644
--- a/design/build.gradle.kts
+++ b/design/build.gradle.kts
@@ -16,17 +16,9 @@ val gVersionCode: Int by rootExtra
 val gVersionName: String by rootExtra
 
 val gKotlinVersion: String by rootExtra
-val gKotlinCoroutineVersion: String by rootExtra
-val gKotlinSerializationVersion: String by rootExtra
-val gRoomVersion: String by rootExtra
-val gAppCenterVersion: String by rootExtra
 val gAndroidKtxVersion: String by rootExtra
-val gLifecycleVersion: String by rootExtra
-val gRecyclerviewVersion: String by rootExtra
 val gAppCompatVersion: String by rootExtra
 val gMaterialDesignVersion: String by rootExtra
-val gShizukuPreferenceVersion: String by rootExtra
-val gMultiprocessPreferenceVersion: String by rootExtra
 
 android {
     compileSdkVersion(gCompileSdkVersion)
@@ -60,7 +52,7 @@ android {
 }
 
 dependencies {
-    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk7:$gKotlinVersion")
+    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:$gKotlinVersion")
     implementation("androidx.appcompat:appcompat:$gAppCompatVersion")
     implementation("androidx.core:core-ktx:$gAndroidKtxVersion")
     implementation("com.google.android.material:material:$gMaterialDesignVersion")
diff --git a/service/build.gradle.kts b/service/build.gradle.kts
index 4411af0..b3c66be 100644
--- a/service/build.gradle.kts
+++ b/service/build.gradle.kts
@@ -21,13 +21,7 @@ val gKotlinVersion: String by rootExtra
 val gKotlinCoroutineVersion: String by rootExtra
 val gKotlinSerializationVersion: String by rootExtra
 val gRoomVersion: String by rootExtra
-val gAppCenterVersion: String by rootExtra
 val gAndroidKtxVersion: String by rootExtra
-val gLifecycleVersion: String by rootExtra
-val gRecyclerviewVersion: String by rootExtra
-val gAppCompatVersion: String by rootExtra
-val gMaterialDesignVersion: String by rootExtra
-val gShizukuPreferenceVersion: String by rootExtra
 val gMultiprocessPreferenceVersion: String by rootExtra
 
 android {