diff --git a/src/main/kotlin/com/github/imflog/schema/registry/tasks/download/DownloadSubjectExtension.kt b/src/main/kotlin/com/github/imflog/schema/registry/tasks/download/DownloadSubjectExtension.kt
index 79d1ffe..50520be 100644
--- a/src/main/kotlin/com/github/imflog/schema/registry/tasks/download/DownloadSubjectExtension.kt
+++ b/src/main/kotlin/com/github/imflog/schema/registry/tasks/download/DownloadSubjectExtension.kt
@@ -3,6 +3,7 @@ package com.github.imflog.schema.registry.tasks.download
 import org.gradle.api.model.ObjectFactory
 import org.gradle.api.provider.ListProperty
 import org.gradle.api.provider.Property
+import java.io.Serializable
 
 open class DownloadSubjectExtension(objects: ObjectFactory) {
 
@@ -66,11 +67,11 @@ data class DownloadSubject(
     val regex: Boolean = false,
     val outputFileName: String? = null,
     val downloadReferences: Boolean = false
-)
+): Serializable
 
 data class MetadataExtension(
     val enabled: Boolean = false,
     val outputPath: String? = null
-) {
+): Serializable  {
     constructor(enabled: Boolean) : this(enabled, null)
 }