diff --git a/.changeset/ten-clocks-approve.md b/.changeset/ten-clocks-approve.md
new file mode 100644
index 00000000..1dc91625
--- /dev/null
+++ b/.changeset/ten-clocks-approve.md
@@ -0,0 +1,5 @@
+---
+"@labdigital/commercetools-mock": minor
+---
+
+add missing addParcelCustomField action to order
diff --git a/src/repositories/order/actions.ts b/src/repositories/order/actions.ts
index b843db2e..f2b0b7ef 100644
--- a/src/repositories/order/actions.ts
+++ b/src/repositories/order/actions.ts
@@ -15,6 +15,7 @@ import type {
 	OrderSetDeliveryCustomFieldAction,
 	OrderSetLocaleAction,
 	OrderSetOrderNumberAction,
+	OrderSetParcelCustomFieldAction,
 	OrderSetPurchaseOrderNumberAction,
 	OrderSetShippingAddressAction,
 	OrderSetStoreAction,
@@ -26,7 +27,6 @@ import type {
 	Store,
 	SyncInfo,
 } from "@commercetools/platform-sdk";
-import assert from "assert";
 import { getBaseResourceProperties } from "~src/helpers";
 import type { Writable } from "~src/types";
 import type { RepositoryContext, UpdateHandlerInterface } from "../abstract";
@@ -194,18 +194,14 @@ export class OrderUpdateHandler
 		resource: Writable<Order>,
 		{ deliveryId, name, value }: OrderSetDeliveryCustomFieldAction,
 	) {
-		assert(resource.shippingInfo, "shippingInfo is not defined");
+		if (!resource.shippingInfo) {
+			throw new Error("Resource has no shipping info");
+		}
 
-		if (Array.isArray(resource.shippingInfo.deliveries)) {
-			resource.shippingInfo.deliveries.map((delivery) => {
-				if (delivery.id !== deliveryId) throw "No matching delivery id found";
-				if (delivery.custom) {
-					const update = delivery.custom.fields;
-					update[name] = value;
-					Object.assign(delivery.custom.fields, update);
-				}
-				return delivery;
-			});
+		for (const delivery of resource.shippingInfo.deliveries || []) {
+			if (delivery.id === deliveryId && delivery.custom?.fields) {
+				delivery.custom.fields[name] = value;
+			}
 		}
 	}
 
@@ -225,6 +221,24 @@ export class OrderUpdateHandler
 		resource.orderNumber = orderNumber;
 	}
 
+	setParcelCustomField(
+		context: RepositoryContext,
+		resource: Writable<Order>,
+		{ parcelId, name, value }: OrderSetParcelCustomFieldAction,
+	) {
+		if (!resource.shippingInfo) {
+			throw new Error("Resource has no shipping info");
+		}
+
+		for (const delivery of resource.shippingInfo.deliveries || []) {
+			for (const parcel of delivery.parcels || []) {
+				if (parcel.id === parcelId && parcel.custom?.fields) {
+					parcel.custom.fields[name] = value;
+				}
+			}
+		}
+	}
+
 	setPurchaseOrderNumber(
 		context: RepositoryContext,
 		resource: Writable<Order>,
diff --git a/src/services/order.test.ts b/src/services/order.test.ts
index 6465ce66..a40ff33c 100644
--- a/src/services/order.test.ts
+++ b/src/services/order.test.ts
@@ -593,6 +593,156 @@ describe("Order Update Actions", () => {
 		).toBe("dhl");
 	});
 
+	test("setParcelCustomField", async () => {
+		const order: Order = {
+			...getBaseResourceProperties(),
+			customLineItems: [],
+			lastMessageSequenceNumber: 0,
+			lineItems: [],
+			orderNumber: "1390",
+			orderState: "Open",
+			origin: "Customer",
+			paymentInfo: {
+				payments: [
+					{
+						typeId: "payment",
+						id: generateRandomString(10),
+					},
+				],
+			},
+			refusedGifts: [],
+			shippingInfo: {
+				shippingMethodName: "Home delivery (package)",
+				price: {
+					type: "centPrecision",
+					currencyCode: "EUR",
+					centAmount: 999,
+					fractionDigits: 2,
+				},
+				shippingRate: {
+					price: {
+						type: "centPrecision",
+						currencyCode: "EUR",
+						centAmount: 999,
+						fractionDigits: 2,
+					},
+					tiers: [
+						{
+							type: "CartScore",
+							score: 24,
+							price: {
+								type: "centPrecision",
+								currencyCode: "EUR",
+								centAmount: 1998,
+								fractionDigits: 2,
+							},
+						},
+						{
+							type: "CartScore",
+							score: 47,
+							price: {
+								type: "centPrecision",
+								currencyCode: "EUR",
+								centAmount: 2997,
+								fractionDigits: 2,
+							},
+						},
+						{
+							type: "CartScore",
+							score: 70,
+							price: {
+								type: "centPrecision",
+								currencyCode: "EUR",
+								centAmount: 3996,
+								fractionDigits: 2,
+							},
+						},
+						{
+							type: "CartScore",
+							score: 93,
+							price: {
+								type: "centPrecision",
+								currencyCode: "EUR",
+								centAmount: 4995,
+								fractionDigits: 2,
+							},
+						},
+					],
+				},
+				deliveries: [
+					{
+						id: "6a458cad-dd46-4f5f-8b73-debOede6a17d",
+						key: "CT-Z243002",
+						createdAt: "2024-07-29T13:37:48.047Z",
+						items: [
+							{
+								id: "5d209544-2892-45c9-bef0-dde4e250188e",
+								quantity: 1,
+							},
+						],
+						parcels: [
+							{
+								id: "7a458cad-dd46-4f5f-8b73-debOede6a17d",
+								createdAt: "2024-07-29T13:37:48.047Z",
+								items: [
+									{
+										id: "5d209544-2892-45c9-bef0-dde4e250188e",
+										quantity: 1,
+									},
+								],
+								custom: {
+									type: {
+										typeId: "type",
+										id: "c493b7bb-d415-450c-b421-e128a8b26569",
+									},
+									fields: {
+										status: "created",
+									},
+								},
+							},
+						],
+					},
+				],
+				shippingMethodState: "MatchesCart",
+			},
+			shipping: [],
+			shippingMode: "Single",
+			syncInfo: [],
+			totalPrice: {
+				type: "centPrecision",
+				fractionDigits: 2,
+				centAmount: 2000,
+				currencyCode: "EUR",
+			},
+		};
+		ctMock.project("dummy").add("order", order);
+
+		const response = await supertest(ctMock.app).get(
+			`/dummy/orders/order-number=${order.orderNumber}`,
+		);
+
+		// check if status is set
+		const _updateResponse = await supertest(ctMock.app)
+			.post(`/dummy/orders/${response.body.id}`)
+			.send({
+				version: 0,
+				actions: [
+					{
+						action: "setParcelCustomField",
+						parcelId: "7a458cad-dd46-4f5f-8b73-debOede6a17d",
+						name: "status",
+						value: "delayed",
+					},
+				],
+			});
+		expect(_updateResponse.status).toBe(200);
+		expect(_updateResponse.body.version).toBe(1);
+		expect(
+			_updateResponse.body.shippingInfo.deliveries[0].parcels[0].custom.fields
+				.status,
+		).toBe("delayed");
+	});
+
 	test("updateSyncInfo", async () => {
 		assert(order, "order not created");