diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Delete.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Delete.kt
index 5b867818..10b919c5 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Delete.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Delete.kt
@@ -4,18 +4,16 @@ import com.fasterxml.jackson.databind.annotation.JsonDeserialize
 import dev.usbharu.hideout.activitypub.domain.model.objects.Object
 import dev.usbharu.hideout.activitypub.domain.model.objects.ObjectDeserializer
 
-open class Delete : Object, HasId, HasActor, HasName {
+open class Delete : Object, HasId, HasActor {
     @JsonDeserialize(using = ObjectDeserializer::class)
     @Suppress("VariableNaming")
     var `object`: Object? = null
     var published: String? = null
     override val actor: String
     override val id: String
-    override val name: String
 
     constructor(
         type: List<String> = emptyList(),
-        name: String = "Delete",
         actor: String,
         id: String,
         `object`: Object,
@@ -23,7 +21,6 @@ open class Delete : Object, HasId, HasActor, HasName {
     ) : super(add(type, "Delete")) {
         this.`object` = `object`
         this.published = published
-        this.name = name
         this.actor = actor
         this.id = id
     }
@@ -39,7 +36,6 @@ open class Delete : Object, HasId, HasActor, HasName {
         if (published != other.published) return false
         if (actor != other.actor) return false
         if (id != other.id) return false
-        if (name != other.name) return false
 
         return true
     }
@@ -50,10 +46,9 @@ open class Delete : Object, HasId, HasActor, HasName {
         result = 31 * result + (published?.hashCode() ?: 0)
         result = 31 * result + actor.hashCode()
         result = 31 * result + id.hashCode()
-        result = 31 * result + name.hashCode()
         return result
     }
 
     override fun toString(): String =
-        "Delete(`object`=$`object`, published=$published, actor='$actor', id='$id', name='$name') ${super.toString()}"
+        "Delete(`object`=$`object`, published=$published, actor='$actor', id='$id') ${super.toString()}"
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Document.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Document.kt
index 489029d0..480c6011 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Document.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Document.kt
@@ -2,24 +2,18 @@ package dev.usbharu.hideout.activitypub.domain.model
 
 import dev.usbharu.hideout.activitypub.domain.model.objects.Object
 
-open class Document : Object, HasName {
+open class Document(
+    type: List<String> = emptyList(),
+    override val name: String = "",
+    mediaType: String,
+    url: String
+) : Object(
+    type = add(type, "Document")
+),
+    HasName {
 
-    var mediaType: String? = null
-    var url: String? = null
-    override val name: String
-
-    constructor(
-        type: List<String> = emptyList(),
-        name: String,
-        mediaType: String,
-        url: String
-    ) : super(
-        type = add(type, "Document")
-    ) {
-        this.mediaType = mediaType
-        this.url = url
-        this.name = name
-    }
+    var mediaType: String? = mediaType
+    var url: String? = url
 
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Emoji.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Emoji.kt
index c270be48..0a91be60 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Emoji.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Emoji.kt
@@ -2,24 +2,17 @@ package dev.usbharu.hideout.activitypub.domain.model
 
 import dev.usbharu.hideout.activitypub.domain.model.objects.Object
 
-open class Emoji : Object {
-    var updated: String? = null
-    var icon: Image? = null
-
-    protected constructor() : super()
-    constructor(
-        type: List<String>,
-        name: String?,
-        actor: String?,
-        id: String?,
-        updated: String?,
-        icon: Image?
-    ) : super(
-        type = add(type, "Emoji")
-    ) {
-        this.updated = updated
-        this.icon = icon
-    }
+open class Emoji(
+    type: List<String>,
+    override val name: String,
+    override val id: String,
+    var updated: String?,
+    var icon: Image?
+) : Object(
+    type = add(type, "Emoji")
+),
+    HasName,
+    HasId {
 
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Undo.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Undo.kt
index f1a0d9d6..857416ef 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Undo.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/Undo.kt
@@ -3,7 +3,6 @@ package dev.usbharu.hideout.activitypub.domain.model
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize
 import dev.usbharu.hideout.activitypub.domain.model.objects.Object
 import dev.usbharu.hideout.activitypub.domain.model.objects.ObjectDeserializer
-import java.time.Instant
 
 open class Undo : Object, HasId, HasActor {
 
@@ -19,10 +18,10 @@ open class Undo : Object, HasId, HasActor {
         actor: String,
         id: String,
         `object`: Object,
-        published: Instant
+        published: String
     ) : super(add(type, "Undo")) {
         this.`object` = `object`
-        this.published = published.toString()
+        this.published = published
         this.id = id
         this.actor = actor
     }
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/objects/ObjectDeserializer.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/objects/ObjectDeserializer.kt
index acbf32e5..f28070e6 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/objects/ObjectDeserializer.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/objects/ObjectDeserializer.kt
@@ -15,9 +15,6 @@ class ObjectDeserializer : JsonDeserializer<Object>() {
         if (treeNode.isValueNode) {
             return ObjectValue(
                 emptyList(),
-                null,
-                null,
-                null,
                 treeNode.asText()
             )
         } else if (treeNode.isObject) {
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/objects/ObjectValue.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/objects/ObjectValue.kt
index 2a9c8eef..62ed4344 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/objects/ObjectValue.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/objects/ObjectValue.kt
@@ -3,30 +3,25 @@ package dev.usbharu.hideout.activitypub.domain.model.objects
 import com.fasterxml.jackson.annotation.JsonCreator
 
 @Suppress("VariableNaming")
-open class ObjectValue : Object {
-
-    lateinit var `object`: String
-
-    @JsonCreator
-    constructor(type: List<String>) : super(
-        type
-    ) {
-        this.`object` = `object`
-    }
+open class ObjectValue @JsonCreator constructor(type: List<String>, var `object`: String) : Object(
+    type
+) {
 
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
-        if (other !is ObjectValue) return false
+        if (javaClass != other?.javaClass) return false
         if (!super.equals(other)) return false
 
+        other as ObjectValue
+
         return `object` == other.`object`
     }
 
     override fun hashCode(): Int {
         var result = super.hashCode()
-        result = 31 * result + (`object`?.hashCode() ?: 0)
+        result = 31 * result + `object`.hashCode()
         return result
     }
 
-    override fun toString(): String = "ObjectValue(`object`=$`object`) ${super.toString()}"
+    override fun toString(): String = "ObjectValue(`object`='$`object`') ${super.toString()}"
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/infrastructure/exposedquery/NoteQueryServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/infrastructure/exposedquery/NoteQueryServiceImpl.kt
index 3348f832..561b8de2 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/infrastructure/exposedquery/NoteQueryServiceImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/infrastructure/exposedquery/NoteQueryServiceImpl.kt
@@ -64,7 +64,6 @@ class NoteQueryServiceImpl(private val postRepository: PostRepository, private v
                 this[Users.followers]
             )
         return Note(
-            name = "Post",
             id = this[Posts.apId],
             attributedTo = this[Users.url],
             content = this[Posts.text],
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/delete/APDeleteProcessor.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/delete/APDeleteProcessor.kt
index 060dc713..f6f136fa 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/delete/APDeleteProcessor.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/delete/APDeleteProcessor.kt
@@ -2,6 +2,7 @@ package dev.usbharu.hideout.activitypub.service.activity.delete
 
 import dev.usbharu.hideout.activitypub.domain.exception.IllegalActivityPubObjectException
 import dev.usbharu.hideout.activitypub.domain.model.Delete
+import dev.usbharu.hideout.activitypub.domain.model.HasId
 import dev.usbharu.hideout.activitypub.service.common.AbstractActivityPubProcessor
 import dev.usbharu.hideout.activitypub.service.common.ActivityPubProcessContext
 import dev.usbharu.hideout.activitypub.service.common.ActivityType
@@ -17,7 +18,11 @@ class APDeleteProcessor(
 ) :
     AbstractActivityPubProcessor<Delete>(transaction) {
     override suspend fun internalProcess(activity: ActivityPubProcessContext<Delete>) {
-        val deleteId = activity.activity.`object`?.id ?: throw IllegalActivityPubObjectException("object.id is null")
+        val value = activity.activity.`object`
+        if (value !is HasId) {
+            throw IllegalActivityPubObjectException("object hasn't id")
+        }
+        val deleteId = value.id
 
         val post = try {
             postQueryService.findByApId(deleteId)
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/follow/APSendFollowService.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/follow/APSendFollowService.kt
index e71e7c79..554fa571 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/follow/APSendFollowService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/follow/APSendFollowService.kt
@@ -15,7 +15,6 @@ class APSendFollowServiceImpl(
 ) : APSendFollowService {
     override suspend fun sendFollow(sendFollowDto: SendFollowDto) {
         val follow = Follow(
-            name = "Follow",
             `object` = sendFollowDto.followTargetUserId.url,
             actor = sendFollowDto.userId.url
         )
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/ApReactionJobProcessor.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/ApReactionJobProcessor.kt
index af3f2f09..3f73bb2e 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/ApReactionJobProcessor.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/ApReactionJobProcessor.kt
@@ -21,7 +21,6 @@ class ApReactionJobProcessor(
         apRequestService.apPost(
             param.inbox,
             Like(
-                name = "Like",
                 actor = param.actor,
                 `object` = param.postUrl,
                 id = "${applicationConfig.url}/liek/note/${param.id}",
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/ApRemoveReactionJobProcessor.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/ApRemoveReactionJobProcessor.kt
index 307f0c16..6a873aca 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/ApRemoveReactionJobProcessor.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/ApRemoveReactionJobProcessor.kt
@@ -28,11 +28,10 @@ class ApRemoveReactionJobProcessor(
         apRequestService.apPost(
             param.inbox,
             Undo(
-                name = "Undo Reaction",
                 actor = param.actor,
                 `object` = like,
                 id = "${applicationConfig.url}/undo/like/${param.id}",
-                published = Instant.now()
+                published = Instant.now().toString()
             ),
             signer
         )
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/user/APUserService.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/user/APUserService.kt
index d69eb9d6..31a2b505 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/user/APUserService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/user/APUserService.kt
@@ -57,13 +57,11 @@ class APUserServiceImpl(
             url = userUrl,
             icon = Image(
                 type = emptyList(),
-                name = "$userUrl/icon.png",
                 mediaType = "image/png",
                 url = "$userUrl/icon.png"
             ),
             publicKey = Key(
                 type = emptyList(),
-                name = "Public Key",
                 id = userEntity.keyId,
                 owner = userUrl,
                 publicKeyPem = userEntity.publicKey
@@ -127,13 +125,11 @@ class APUserServiceImpl(
         url = id,
         icon = Image(
             type = emptyList(),
-            name = "$id/icon.png",
             mediaType = "image/png",
             url = "$id/icon.png"
         ),
         publicKey = Key(
             type = emptyList(),
-            name = "Public Key",
             id = userEntity.keyId,
             owner = id,
             publicKeyPem = userEntity.publicKey
diff --git a/src/main/kotlin/dev/usbharu/hideout/application/config/ActivityPubConfig.kt b/src/main/kotlin/dev/usbharu/hideout/application/config/ActivityPubConfig.kt
index d6bdf301..d661a30a 100644
--- a/src/main/kotlin/dev/usbharu/hideout/application/config/ActivityPubConfig.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/application/config/ActivityPubConfig.kt
@@ -25,6 +25,7 @@ class ActivityPubConfig {
             .enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY)
             .setSerializationInclusion(JsonInclude.Include.NON_EMPTY)
             .setDefaultSetterInfo(JsonSetter.Value.forContentNulls(Nulls.AS_EMPTY))
+            .setDefaultSetterInfo(JsonSetter.Value.forValueNulls(Nulls.AS_EMPTY))
             .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
             .configure(JsonParser.Feature.ALLOW_COMMENTS, true)
             .configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true)
diff --git a/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/DeleteSerializeTest.kt b/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/DeleteSerializeTest.kt
index 4f190250..21de8c61 100644
--- a/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/DeleteSerializeTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/DeleteSerializeTest.kt
@@ -46,7 +46,6 @@ class DeleteSerializeTest {
         val readValue = objectMapper.readValue<Delete>(json)
 
         val expected = Delete(
-            name = null,
             actor = "https://misskey.usbharu.dev/users/97ws8y3rj6",
             id = "https://misskey.usbharu.dev/4b5b6ed5-9269-45f3-8403-cba1e74b4b69",
             `object` = Tombstone(
@@ -61,7 +60,6 @@ class DeleteSerializeTest {
     @Test
     fun シリアライズできる() {
         val delete = Delete(
-            name = null,
             actor = "https://misskey.usbharu.dev/users/97ws8y3rj6",
             id = "https://misskey.usbharu.dev/4b5b6ed5-9269-45f3-8403-cba1e74b4b69",
             `object` = Tombstone(
@@ -75,7 +73,7 @@ class DeleteSerializeTest {
 
         val actual = objectMapper.writeValueAsString(delete)
         val expected =
-            """{"type":"Delete","actor":"https://misskey.usbharu.dev/users/97ws8y3rj6","id":"https://misskey.usbharu.dev/4b5b6ed5-9269-45f3-8403-cba1e74b4b69","object":{"type":"Tombstone","name":"Tombstone","id":"https://misskey.usbharu.dev/notes/9lkwqnwqk9"},"published":"2023-11-02T15:30:34.160Z"}"""
+            """{"type":"Delete","actor":"https://misskey.usbharu.dev/users/97ws8y3rj6","id":"https://misskey.usbharu.dev/4b5b6ed5-9269-45f3-8403-cba1e74b4b69","object":{"type":"Tombstone","id":"https://misskey.usbharu.dev/notes/9lkwqnwqk9"},"published":"2023-11-02T15:30:34.160Z"}"""
         assertEquals(expected, actual)
     }
 }
diff --git a/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/NoteSerializeTest.kt b/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/NoteSerializeTest.kt
index 1b05eef1..9e1397a9 100644
--- a/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/NoteSerializeTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/NoteSerializeTest.kt
@@ -10,7 +10,6 @@ class NoteSerializeTest {
     @Test
     fun Noteのシリアライズができる() {
         val note = Note(
-            name = "Note",
             id = "https://example.com",
             attributedTo = "https://example.com/actor",
             content = "Hello",
@@ -22,7 +21,7 @@ class NoteSerializeTest {
         val writeValueAsString = objectMapper.writeValueAsString(note)
 
         assertEquals(
-            "{\"type\":\"Note\",\"name\":\"Note\",\"id\":\"https://example.com\",\"attributedTo\":\"https://example.com/actor\",\"content\":\"Hello\",\"published\":\"2023-05-20T10:28:17.308Z\",\"sensitive\":false}",
+            """{"type":"Note","id":"https://example.com","attributedTo":"https://example.com/actor","content":"Hello","published":"2023-05-20T10:28:17.308Z","sensitive":false}""",
             writeValueAsString
         )
     }
@@ -65,7 +64,6 @@ class NoteSerializeTest {
         val readValue = objectMapper.readValue<Note>(json)
 
         val note = Note(
-            name = "",
             id = "https://misskey.usbharu.dev/notes/9f2i9cm88e",
             type = listOf("Note"),
             attributedTo = "https://misskey.usbharu.dev/users/97ws8y3rj6",
@@ -77,7 +75,6 @@ class NoteSerializeTest {
             inReplyTo = "https://calckey.jp/notes/9f2i7ymf1d",
             attachment = emptyList()
         )
-        note.name = null
         assertEquals(note, readValue)
     }
 }
diff --git a/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/UndoTest.kt b/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/UndoTest.kt
index 97ba9bc4..ea279694 100644
--- a/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/UndoTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/UndoTest.kt
@@ -1,8 +1,8 @@
 package dev.usbharu.hideout.activitypub.domain.model
 
+import dev.usbharu.hideout.application.config.ActivityPubConfig
 import org.intellij.lang.annotations.Language
 import org.junit.jupiter.api.Test
-import utils.JsonObjectMapper
 import java.time.Clock
 import java.time.Instant
 import java.time.ZoneId
@@ -12,18 +12,16 @@ class UndoTest {
     fun Undoのシリアライズができる() {
         val undo = Undo(
             emptyList(),
-            "Undo Follow",
             "https://follower.example.com/",
             "https://follower.example.com/undo/1",
             Follow(
                 emptyList(),
-                null,
                 "https://follower.example.com/users/",
                 actor = "https://follower.exaple.com/users/1"
             ),
-            Instant.now(Clock.tickMillis(ZoneId.systemDefault()))
+            Instant.now(Clock.tickMillis(ZoneId.systemDefault())).toString()
         )
-        val writeValueAsString = JsonObjectMapper.objectMapper.writeValueAsString(undo)
+        val writeValueAsString = ActivityPubConfig().objectMapper().writeValueAsString(undo)
         println(writeValueAsString)
     }
 
@@ -70,7 +68,7 @@ class UndoTest {
   
         """.trimIndent()
 
-        val undo = JsonObjectMapper.objectMapper.readValue(json, Undo::class.java)
+        val undo = ActivityPubConfig().objectMapper().readValue(json, Undo::class.java)
         println(undo)
     }
 }
diff --git a/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/objects/ObjectSerializeTest.kt b/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/objects/ObjectSerializeTest.kt
index 77f2579b..41bc114e 100644
--- a/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/objects/ObjectSerializeTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/objects/ObjectSerializeTest.kt
@@ -16,10 +16,7 @@ class ObjectSerializeTest {
         val readValue = objectMapper.readValue<Object>(json)
 
         val expected = Object(
-            listOf("Object"),
-            null,
-            null,
-            null
+            listOf("Object")
         )
         assertEquals(expected, readValue)
     }
@@ -34,10 +31,7 @@ class ObjectSerializeTest {
         val readValue = objectMapper.readValue<Object>(json)
 
         val expected = Object(
-            listOf("Hoge", "Object"),
-            null,
-            null,
-            null
+            listOf("Hoge", "Object")
         )
 
         assertEquals(expected, readValue)
@@ -53,10 +47,7 @@ class ObjectSerializeTest {
         val readValue = objectMapper.readValue<Object>(json)
 
         val expected = Object(
-            emptyList(),
-            null,
-            null,
-            null
+            emptyList()
         )
 
         assertEquals(expected, readValue)
diff --git a/src/test/kotlin/dev/usbharu/hideout/activitypub/interfaces/api/actor/UserAPControllerImplTest.kt b/src/test/kotlin/dev/usbharu/hideout/activitypub/interfaces/api/actor/UserAPControllerImplTest.kt
index 9520eac2..42f44e27 100644
--- a/src/test/kotlin/dev/usbharu/hideout/activitypub/interfaces/api/actor/UserAPControllerImplTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/activitypub/interfaces/api/actor/UserAPControllerImplTest.kt
@@ -49,12 +49,10 @@ class UserAPControllerImplTest {
             outbox = "https://example.com/users/hoge/outbox",
             url = "https://example.com/users/hoge",
             icon = Image(
-                name = "icon",
                 mediaType = "image/jpeg",
                 url = "https://example.com/users/hoge/icon.jpg"
             ),
             publicKey = Key(
-                name = "Public Key",
                 id = "https://example.com/users/hoge#pubkey",
                 owner = "https://example.com/users/hoge",
                 publicKeyPem = "-----BEGIN PUBLIC KEY-----...-----END PUBLIC KEY-----",
diff --git a/src/test/kotlin/dev/usbharu/hideout/activitypub/interfaces/api/note/NoteApControllerImplTest.kt b/src/test/kotlin/dev/usbharu/hideout/activitypub/interfaces/api/note/NoteApControllerImplTest.kt
index c337e770..bfa7168e 100644
--- a/src/test/kotlin/dev/usbharu/hideout/activitypub/interfaces/api/note/NoteApControllerImplTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/activitypub/interfaces/api/note/NoteApControllerImplTest.kt
@@ -53,7 +53,6 @@ class NoteApControllerImplTest {
     fun `postAP 匿名で取得できる`() = runTest {
         SecurityContextHolder.clearContext()
         val note = Note(
-            name = "Note",
             id = "https://example.com/users/hoge/posts/1234",
             attributedTo = "https://example.com/users/hoge",
             content = "Hello",
@@ -90,7 +89,6 @@ class NoteApControllerImplTest {
     @Test
     fun `postAP 認証に成功している場合userIdがnullでない`() = runTest {
         val note = Note(
-            name = "Note",
             id = "https://example.com/users/hoge/posts/1234",
             attributedTo = "https://example.com/users/hoge",
             content = "Hello",
diff --git a/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/create/ApSendCreateServiceImplTest.kt b/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/create/ApSendCreateServiceImplTest.kt
index 47b5671e..01975882 100644
--- a/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/create/ApSendCreateServiceImplTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/create/ApSendCreateServiceImplTest.kt
@@ -52,7 +52,6 @@ class ApSendCreateServiceImplTest {
         val post = PostBuilder.of()
         val user = UserBuilder.localUserOf(id = post.userId)
         val note = Note(
-            name = "Post",
             id = post.apId,
             attributedTo = user.url,
             content = post.text,
diff --git a/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/follow/APSendFollowServiceImplTest.kt b/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/follow/APSendFollowServiceImplTest.kt
index 6ce3a084..93e1d76d 100644
--- a/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/follow/APSendFollowServiceImplTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/follow/APSendFollowServiceImplTest.kt
@@ -24,7 +24,6 @@ class APSendFollowServiceImplTest {
         apSendFollowServiceImpl.sendFollow(sendFollowDto)
 
         val value = Follow(
-            name = "Follow",
             `object` = sendFollowDto.followTargetUserId.url,
             actor = sendFollowDto.userId.url
         )
diff --git a/src/test/kotlin/dev/usbharu/hideout/activitypub/service/common/APRequestServiceImplTest.kt b/src/test/kotlin/dev/usbharu/hideout/activitypub/service/common/APRequestServiceImplTest.kt
index ec36d233..2c609183 100644
--- a/src/test/kotlin/dev/usbharu/hideout/activitypub/service/common/APRequestServiceImplTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/activitypub/service/common/APRequestServiceImplTest.kt
@@ -39,7 +39,7 @@ class APRequestServiceImplTest {
                 assertDoesNotThrow {
                     dateTimeFormatter.parse(it.headers["Date"])
                 }
-                respond("{}")
+                respond("""{"type":"Follow","object": "https://example.com","actor": "https://example.com"}""")
             }),
             objectMapper,
             mock(),
@@ -47,7 +47,6 @@ class APRequestServiceImplTest {
         )
 
         val responseClass = Follow(
-            name = "Follow",
             `object` = "https://example.com",
             actor = "https://example.com"
         )
@@ -65,7 +64,7 @@ class APRequestServiceImplTest {
                 assertDoesNotThrow {
                     dateTimeFormatter.parse(it.headers["Date"])
                 }
-                respond("{}")
+                respond("""{"type":"Follow","object": "https://example.com","actor": "https://example.com"}""")
             }),
             objectMapper,
             mock(),
@@ -73,7 +72,6 @@ class APRequestServiceImplTest {
         )
 
         val responseClass = Follow(
-            name = "Follow",
             `object` = "https://example.com",
             actor = "https://example.com"
         )
@@ -106,7 +104,7 @@ class APRequestServiceImplTest {
                 assertDoesNotThrow {
                     dateTimeFormatter.parse(it.headers["Date"])
                 }
-                respond("{}")
+                respond("""{"type":"Follow","object": "https://example.com","actor": "https://example.com"}""")
             }),
             objectMapper,
             httpSignatureSigner,
@@ -114,7 +112,6 @@ class APRequestServiceImplTest {
         )
 
         val responseClass = Follow(
-            name = "Follow",
             `object` = "https://example.com",
             actor = "https://example.com"
         )
@@ -166,7 +163,6 @@ class APRequestServiceImplTest {
         }), objectMapper, mock(), dateTimeFormatter)
 
         val body = Follow(
-            name = "Follow",
             `object` = "https://example.com",
             actor = "https://example.com"
         )
@@ -213,7 +209,6 @@ class APRequestServiceImplTest {
         }), objectMapper, mock(), dateTimeFormatter)
 
         val body = Follow(
-            name = "Follow",
             `object` = "https://example.com",
             actor = "https://example.com"
         )
@@ -244,7 +239,6 @@ class APRequestServiceImplTest {
         }), objectMapper, mock(), dateTimeFormatter)
 
         val body = Follow(
-            name = "Follow",
             `object` = "https://example.com",
             actor = "https://example.com"
         )
@@ -286,7 +280,6 @@ class APRequestServiceImplTest {
         }), objectMapper, httpSignatureSigner, dateTimeFormatter)
 
         val body = Follow(
-            name = "Follow",
             `object` = "https://example.com",
             actor = "https://example.com"
         )
@@ -337,7 +330,6 @@ class APRequestServiceImplTest {
         }), objectMapper, mock(), dateTimeFormatter)
 
         val body = Follow(
-            name = "Follow",
             `object` = "https://example.com",
             actor = "https://example.com"
         )
diff --git a/src/test/kotlin/dev/usbharu/hideout/activitypub/service/objects/note/APNoteServiceImplTest.kt b/src/test/kotlin/dev/usbharu/hideout/activitypub/service/objects/note/APNoteServiceImplTest.kt
index 540f642c..5ed6597d 100644
--- a/src/test/kotlin/dev/usbharu/hideout/activitypub/service/objects/note/APNoteServiceImplTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/activitypub/service/objects/note/APNoteServiceImplTest.kt
@@ -56,7 +56,6 @@ class APNoteServiceImplTest {
             onBlocking { findById(eq(post.userId)) } doReturn user
         }
         val expected = Note(
-            name = "Post",
             id = post.apId,
             attributedTo = user.url,
             content = post.text,
@@ -98,7 +97,6 @@ class APNoteServiceImplTest {
             onBlocking { findById(eq(post.userId)) } doReturn user
         }
         val note = Note(
-            name = "Post",
             id = post.apId,
             attributedTo = user.url,
             content = post.text,
@@ -124,13 +122,11 @@ class APNoteServiceImplTest {
             url = user.url,
             icon = Image(
                 type = emptyList(),
-                name = user.url + "/icon.png",
                 mediaType = "image/png",
                 url = user.url + "/icon.png"
             ),
             publicKey = Key(
                 type = emptyList(),
-                name = "Public Key",
                 id = user.keyId,
                 owner = user.url,
                 publicKeyPem = user.publicKey
@@ -177,7 +173,6 @@ class APNoteServiceImplTest {
                 onBlocking { findById(eq(post.userId)) } doReturn user
             }
             val note = Note(
-                name = "Post",
                 id = post.apId,
                 attributedTo = user.url,
                 content = post.text,
@@ -246,11 +241,11 @@ class APNoteServiceImplTest {
             outbox = user.outbox,
             url = user.url,
             icon = Image(
-                name = user.url + "/icon.png", mediaType = "image/png", url = user.url + "/icon.png"
+                mediaType = "image/png",
+                url = user.url + "/icon.png"
             ),
             publicKey = Key(
                 type = emptyList(),
-                name = "Public Key",
                 id = user.keyId,
                 owner = user.url,
                 publicKeyPem = user.publicKey
@@ -278,7 +273,6 @@ class APNoteServiceImplTest {
         )
 
         val note = Note(
-            name = "Post",
             id = post.apId,
             attributedTo = user.url,
             content = post.text,
@@ -311,7 +305,6 @@ class APNoteServiceImplTest {
             onBlocking { findById(eq(user.id)) } doReturn user
         }
         val note = Note(
-            name = "Post",
             id = post.apId,
             attributedTo = user.url,
             content = post.text,
diff --git a/src/test/kotlin/dev/usbharu/hideout/ap/ContextSerializerTest.kt b/src/test/kotlin/dev/usbharu/hideout/ap/ContextSerializerTest.kt
index db434005..d73e31d7 100644
--- a/src/test/kotlin/dev/usbharu/hideout/ap/ContextSerializerTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/ap/ContextSerializerTest.kt
@@ -13,7 +13,6 @@ class ContextSerializerTest {
             name = "aaa",
             actor = "bbb",
             `object` = Follow(
-                name = "ccc",
                 `object` = "ddd",
                 actor = "aaa"
             )