diff --git a/Sources/APNSCore/LiveActivity/APNSLiveActivityNotification.swift b/Sources/APNSCore/LiveActivity/APNSLiveActivityNotification.swift
index e6e80ff..7127a40 100644
--- a/Sources/APNSCore/LiveActivity/APNSLiveActivityNotification.swift
+++ b/Sources/APNSCore/LiveActivity/APNSLiveActivityNotification.swift
@@ -104,6 +104,7 @@ public struct APNSLiveActivityNotification<ContentState: Encodable & Sendable>:
     ///   - timestamp: Timestamp when sending notification
     ///   - dismissalDate: Timestamp when to dismiss live notification when sent with `end`, if in the past
     ///    dismiss immediately
+    ///   - staleDate: Timestamp when the notification is marked as stale
     public init(
         expiration: APNSNotificationExpiration,
         priority: APNSPriority,
@@ -113,17 +114,20 @@ public struct APNSLiveActivityNotification<ContentState: Encodable & Sendable>:
         alert: APNSAlertNotificationContent? = nil,
         timestamp: Int,
         dismissalDate: APNSLiveActivityDismissalDate = .none,
+        staleDate: Int? = nil,
         apnsID: UUID? = nil
     ) {
         self.init(
             expiration: expiration,
             priority: priority,
             topic: appID + ".push-type.liveactivity",
+            apnsID: apnsID,
             contentState: contentState,
             event: event,
             alert: alert,
             timestamp: timestamp,
-            dismissalDate: dismissalDate
+            dismissalDate: dismissalDate,
+            staleDate: staleDate
         )
     }
 
@@ -143,6 +147,7 @@ public struct APNSLiveActivityNotification<ContentState: Encodable & Sendable>:
     ///   - timestamp: Timestamp when sending notification
     ///   - dismissalDate: Timestamp when to dismiss live notification when sent with `end`, if in the past
     ///    dismiss immediately
+    ///   - staleDate: Timestamp when the notification is marked as stale
     public init(
         expiration: APNSNotificationExpiration,
         priority: APNSPriority,
@@ -152,13 +157,15 @@ public struct APNSLiveActivityNotification<ContentState: Encodable & Sendable>:
         event: APNSLiveActivityNotificationEvent,
         alert: APNSAlertNotificationContent? = nil,
         timestamp: Int,
-        dismissalDate: APNSLiveActivityDismissalDate = .none
+        dismissalDate: APNSLiveActivityDismissalDate = .none,
+        staleDate: Int? = nil
     ) {
         self.aps = APNSLiveActivityNotificationAPSStorage(
             timestamp: timestamp,
             event: event.rawValue,
             contentState: contentState,
             dismissalDate: dismissalDate.dismissal,
+            staleDate: staleDate,
             alert: alert
         )
         self.apnsID = apnsID
diff --git a/Sources/APNSCore/LiveActivity/APNSLiveActivityNotificationAPSStorage.swift b/Sources/APNSCore/LiveActivity/APNSLiveActivityNotificationAPSStorage.swift
index fa44a27..5b96a0c 100644
--- a/Sources/APNSCore/LiveActivity/APNSLiveActivityNotificationAPSStorage.swift
+++ b/Sources/APNSCore/LiveActivity/APNSLiveActivityNotificationAPSStorage.swift
@@ -18,6 +18,7 @@ struct APNSLiveActivityNotificationAPSStorage<ContentState: Encodable & Sendable
         case event = "event"
         case contentState = "content-state"
         case dismissalDate = "dismissal-date"
+        case staleDate = "stale-date"
         case alert = "alert"
     }
 
@@ -25,6 +26,7 @@ struct APNSLiveActivityNotificationAPSStorage<ContentState: Encodable & Sendable
     var event: String
     var contentState: ContentState
     var dismissalDate: Int?
+    var staleDate: Int?
     var alert: APNSAlertNotificationContent?
 
     init(
@@ -32,11 +34,13 @@ struct APNSLiveActivityNotificationAPSStorage<ContentState: Encodable & Sendable
         event: String,
         contentState: ContentState,
         dismissalDate: Int?,
+        staleDate: Int?,
         alert: APNSAlertNotificationContent? = nil
     ) {
         self.timestamp = timestamp
         self.contentState = contentState
         self.dismissalDate = dismissalDate
+        self.staleDate = staleDate
         self.event = event
         self.alert = alert
     }
diff --git a/Tests/APNSTests/LiveActivity/APNSLiveActivityNotificationTests.swift b/Tests/APNSTests/LiveActivity/APNSLiveActivityNotificationTests.swift
index 8b4ca8e..8f52ff8 100644
--- a/Tests/APNSTests/LiveActivity/APNSLiveActivityNotificationTests.swift
+++ b/Tests/APNSTests/LiveActivity/APNSLiveActivityNotificationTests.swift
@@ -49,6 +49,31 @@ final class APNSLiveActivityNotificationTests: XCTestCase {
         XCTAssertEqual(jsonObject1, jsonObject2)
     }
 
+    func testEncodeUpdateStale() throws {
+        let notification = APNSLiveActivityNotification(
+            expiration: .immediately,
+            priority: .immediately,
+            appID: "test.app.id",
+            contentState: State(),
+            event: .update,
+            timestamp: 1_672_680_658,
+            staleDate: 1_672_680_800)
+
+        let encoder = JSONEncoder()
+        let data = try encoder.encode(notification)
+
+        let expectedJSONString = """
+            {"aps":{"event":"update","content-state":{"string":"Test","number":123},"timestamp":1672680658,
+            "stale-date":1672680800}}
+            """
+
+        let jsonObject1 = try JSONSerialization.jsonObject(with: data) as! NSDictionary
+        let jsonObject2 =
+            try JSONSerialization.jsonObject(with: expectedJSONString.data(using: .utf8)!)
+            as! NSDictionary
+        XCTAssertEqual(jsonObject1, jsonObject2)
+    }
+
     func testEncodeUpdateAlert() throws {
         let notification = APNSLiveActivityNotification(
             expiration: .immediately,