diff --git a/packages/nodes-base/nodes/InvoiceNinja/InvoiceNinja.node.ts b/packages/nodes-base/nodes/InvoiceNinja/InvoiceNinja.node.ts
index 74032ba884..54e668a1af 100644
--- a/packages/nodes-base/nodes/InvoiceNinja/InvoiceNinja.node.ts
+++ b/packages/nodes-base/nodes/InvoiceNinja/InvoiceNinja.node.ts
@@ -472,15 +472,25 @@ export class InvoiceNinja implements INodeType {
 									cost: itemValue.cost as number,
 									notes: itemValue.description as string,
 									product_key: itemValue.service as string,
-									qty: itemValue.hours as number,
 									tax_rate1: itemValue.taxRate1 as number,
 									tax_rate2: itemValue.taxRate2 as number,
 									tax_name1: itemValue.taxName1 as string,
 									tax_name2: itemValue.taxName2 as string,
 								};
+								if (apiVersion === 'v4') {
+									item.qty = itemValue.hours as number;
+								}
+								if (apiVersion === 'v5') {
+									item.quantity = itemValue.hours as number;
+								}
 								invoiceItems.push(item);
 							}
-							body.invoice_items = invoiceItems;
+							if (apiVersion === 'v4') {
+								body.invoice_items = invoiceItems;
+							}
+							if (apiVersion === 'v5') {
+								body.line_items = invoiceItems;
+							}
 						}
 						responseData = await invoiceNinjaApiRequest.call(
 							this,
@@ -902,15 +912,25 @@ export class InvoiceNinja implements INodeType {
 									cost: itemValue.cost as number,
 									notes: itemValue.description as string,
 									product_key: itemValue.service as string,
-									qty: itemValue.hours as number,
 									tax_rate1: itemValue.taxRate1 as number,
 									tax_rate2: itemValue.taxRate2 as number,
 									tax_name1: itemValue.taxName1 as string,
 									tax_name2: itemValue.taxName2 as string,
 								};
+								if (apiVersion === 'v4') {
+									item.qty = itemValue.hours as number;
+								}
+								if (apiVersion === 'v5') {
+									item.quantity = itemValue.hours as number;
+								}
 								invoiceItems.push(item);
 							}
-							body.invoice_items = invoiceItems;
+							if (apiVersion === 'v4') {
+								body.invoice_items = invoiceItems;
+							}
+							if (apiVersion === 'v5') {
+								body.line_items = invoiceItems;
+							}
 						}
 						responseData = await invoiceNinjaApiRequest.call(
 							this,
diff --git a/packages/nodes-base/nodes/InvoiceNinja/QuoteInterface.ts b/packages/nodes-base/nodes/InvoiceNinja/QuoteInterface.ts
index 7b053b8acc..f1e5329e41 100644
--- a/packages/nodes-base/nodes/InvoiceNinja/QuoteInterface.ts
+++ b/packages/nodes-base/nodes/InvoiceNinja/QuoteInterface.ts
@@ -3,6 +3,7 @@ export interface IItem {
 	notes?: string;
 	product_key?: string;
 	qty?: number;
+	quantity?: number;
 	tax_rate1?: number;
 	tax_rate2?: number;
 	tax_name1?: string;
@@ -20,6 +21,7 @@ export interface IQuote {
 	email?: string;
 	invoice_date?: string;
 	invoice_items?: IItem[];
+	line_items?: IItem[];
 	invoice_number?: string;
 	invoice_status_id?: number;
 	is_amount_discount?: boolean;
diff --git a/packages/nodes-base/nodes/InvoiceNinja/invoiceInterface.ts b/packages/nodes-base/nodes/InvoiceNinja/invoiceInterface.ts
index ab61e4fd96..22a8728ae4 100644
--- a/packages/nodes-base/nodes/InvoiceNinja/invoiceInterface.ts
+++ b/packages/nodes-base/nodes/InvoiceNinja/invoiceInterface.ts
@@ -3,6 +3,7 @@ export interface IItem {
 	notes?: string;
 	product_key?: string;
 	qty?: number;
+	quantity?: number;
 	tax_rate1?: number;
 	tax_rate2?: number;
 	tax_name1?: string;
@@ -20,6 +21,7 @@ export interface IInvoice {
 	due_date?: string;
 	invoice_date?: string;
 	invoice_items?: IItem[];
+	line_items?: IItem[];
 	invoice_number?: string;
 	invoice_status_id?: number;
 	is_amount_discount?: boolean;