diff --git a/core/build.gradle.kts b/core/build.gradle.kts
index b97039f..8e79fcf 100644
--- a/core/build.gradle.kts
+++ b/core/build.gradle.kts
@@ -64,6 +64,16 @@ kotlin {
     }
 }
 
+configurations.named("lintPublish") {
+    // kotlin-stdlib is provided by the lint host at runtime; exclude it so AGP
+    // sees exactly one JAR in lintPublish and does not fail with "Found more than one jar".
+    isTransitive = false
+}
+
+dependencies {
+    lintPublish(project(":featured-lint-rules"))
+}
+
 // Zips the release XCFramework for distribution via Swift Package Manager.
 // Output: build/xcframeworks/FeaturedCore.xcframework.zip
 val zipXCFramework by tasks.registering(Zip::class) {
diff --git a/sample/android-app/build.gradle.kts b/sample/android-app/build.gradle.kts
index 7ec60e0..3b79be2 100644
--- a/sample/android-app/build.gradle.kts
+++ b/sample/android-app/build.gradle.kts
@@ -24,6 +24,11 @@ android {
         versionName = "1.0.0"
     }
 
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_21
+        targetCompatibility = JavaVersion.VERSION_21
+    }
+
     buildFeatures {
         compose = true
     }