diff --git a/upub/core/src/model/actor.rs b/upub/core/src/model/actor.rs
index a36e14a..57f5243 100644
--- a/upub/core/src/model/actor.rs
+++ b/upub/core/src/model/actor.rs
@@ -8,6 +8,8 @@ use crate::ext::{JsonVec, TypeName};
 pub struct Field {
 	pub name: String,
 	pub value: String,
+
+	#[serde(skip_serializing_if = "Option::is_none")]
 	pub verified_at: Option<ChronoDateTimeUtc>,
 
 	#[serde(rename = "type")]