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 677d3c7d..caa6caff 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
@@ -58,7 +58,7 @@ class ObjectDeserializer : JsonDeserializer<Object>() {
                 ExtendedActivityVocabulary.Move -> TODO()
                 ExtendedActivityVocabulary.Offer -> TODO()
                 ExtendedActivityVocabulary.Question -> TODO()
-                ExtendedActivityVocabulary.Reject -> TODO()
+                ExtendedActivityVocabulary.Reject -> p.codec.treeToValue(treeNode, Reject::class.java)
                 ExtendedActivityVocabulary.Read -> TODO()
                 ExtendedActivityVocabulary.Remove -> TODO()
                 ExtendedActivityVocabulary.TentativeReject -> TODO()