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 48409e92..07223628 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
@@ -11,7 +11,7 @@ open class Delete : Object {
 
     constructor(
         type: List<String> = emptyList(),
-        name: String = "Delete",
+        name: String? = "Delete",
         actor: String,
         id: String,
         `object`: Object,
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/JsonLd.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/JsonLd.kt
index a369e036..74b0459e 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/JsonLd.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/domain/model/JsonLd.kt
@@ -40,6 +40,8 @@ open class JsonLd {
 }
 
 class ContextDeserializer : JsonDeserializer<String>() {
+
+
     override fun deserialize(
         p0: com.fasterxml.jackson.core.JsonParser?,
         p1: com.fasterxml.jackson.databind.DeserializationContext?
@@ -54,11 +56,18 @@ class ContextDeserializer : JsonDeserializer<String>() {
 
 class ContextSerializer : JsonSerializer<List<String>>() {
 
-    override fun isEmpty(value: List<String>?): Boolean = value.isNullOrEmpty()
+    override fun isEmpty(value: List<String>?): Boolean {
+        return value.isNullOrEmpty()
+    }
+
+    override fun isEmpty(provider: SerializerProvider?, value: List<String>?): Boolean {
+        return value.isNullOrEmpty()
+    }
+
+    override fun serialize(value: List<String>?, gen: JsonGenerator?, serializers: SerializerProvider) {
 
-    override fun serialize(value: List<String>?, gen: JsonGenerator?, serializers: SerializerProvider?) {
         if (value.isNullOrEmpty()) {
-            gen?.writeNull()
+            serializers.defaultSerializeNull(gen)
             return
         }
         if (value.size == 1) {
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
new file mode 100644
index 00000000..4f190250
--- /dev/null
+++ b/src/test/kotlin/dev/usbharu/hideout/activitypub/domain/model/DeleteSerializeTest.kt
@@ -0,0 +1,81 @@
+package dev.usbharu.hideout.activitypub.domain.model
+
+import com.fasterxml.jackson.module.kotlin.readValue
+import dev.usbharu.hideout.application.config.ActivityPubConfig
+import org.intellij.lang.annotations.Language
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+
+class DeleteSerializeTest {
+    @Test
+    fun Misskeyの発行するJSONをデシリアライズできる() {
+        @Language("JSON") val json = """{
+  "@context" : [ "https://www.w3.org/ns/activitystreams", "https://w3id.org/security/v1", {
+    "manuallyApprovesFollowers" : "as:manuallyApprovesFollowers",
+    "sensitive" : "as:sensitive",
+    "Hashtag" : "as:Hashtag",
+    "quoteUrl" : "as:quoteUrl",
+    "toot" : "http://joinmastodon.org/ns#",
+    "Emoji" : "toot:Emoji",
+    "featured" : "toot:featured",
+    "discoverable" : "toot:discoverable",
+    "schema" : "http://schema.org#",
+    "PropertyValue" : "schema:PropertyValue",
+    "value" : "schema:value",
+    "misskey" : "https://misskey-hub.net/ns#",
+    "_misskey_content" : "misskey:_misskey_content",
+    "_misskey_quote" : "misskey:_misskey_quote",
+    "_misskey_reaction" : "misskey:_misskey_reaction",
+    "_misskey_votes" : "misskey:_misskey_votes",
+    "isCat" : "misskey:isCat",
+    "vcard" : "http://www.w3.org/2006/vcard/ns#"
+  } ],
+  "type" : "Delete",
+  "actor" : "https://misskey.usbharu.dev/users/97ws8y3rj6",
+  "object" : {
+    "id" : "https://misskey.usbharu.dev/notes/9lkwqnwqk9",
+    "type" : "Tombstone"
+  },
+  "published" : "2023-11-02T15:30:34.160Z",
+  "id" : "https://misskey.usbharu.dev/4b5b6ed5-9269-45f3-8403-cba1e74b4b69"
+}
+"""
+
+        val objectMapper = ActivityPubConfig().objectMapper()
+
+        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(
+                id = "https://misskey.usbharu.dev/notes/9lkwqnwqk9",
+            ),
+            published = "2023-11-02T15:30:34.160Z",
+        )
+        expected.context = listOf("https://www.w3.org/ns/activitystreams", "https://w3id.org/security/v1", "")
+        assertEquals(expected, readValue)
+    }
+
+    @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(
+                id = "https://misskey.usbharu.dev/notes/9lkwqnwqk9",
+            ),
+            published = "2023-11-02T15:30:34.160Z",
+        )
+
+
+        val objectMapper = ActivityPubConfig().objectMapper()
+
+        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"}"""
+        assertEquals(expected, actual)
+    }
+}