diff --git a/packages/object/src/index.ts b/packages/object/src/index.ts
index 77119466..6cc0ee5b 100644
--- a/packages/object/src/index.ts
+++ b/packages/object/src/index.ts
@@ -246,7 +246,7 @@ export class DRPObject implements ObjectPb.DRPObjectBase {
 	 */
 	private _mergeWithDrp(vertices: Vertex[]): [merged: boolean, missing: string[]] {
 		const missing: Hash[] = [];
-		const newVertices: Vertex[] = this.vertices;
+		const newVertices: Vertex[] = [];
 		for (const vertex of vertices) {
 			// Check to avoid manually crafted `undefined` operations
 			if (!vertex.operation || this.hashGraph.vertices.has(vertex.hash)) {
@@ -289,6 +289,7 @@ export class DRPObject implements ObjectPb.DRPObjectBase {
 			}
 		}
 
+		this.vertices = this.hashGraph.getAllVertices();
 		this._updateObjectACLState();
 		this._updateDRPState();
 		this._notify("merge", newVertices);
diff --git a/packages/object/tests/hashgraph.test.ts b/packages/object/tests/hashgraph.test.ts
index 914eb375..84a37ffe 100644
--- a/packages/object/tests/hashgraph.test.ts
+++ b/packages/object/tests/hashgraph.test.ts
@@ -3,6 +3,7 @@ import { SetDRP } from "@ts-drp/blueprints/src/Set/index.js";
 import { beforeAll, beforeEach, describe, expect, test } from "vitest";
 
 import { ObjectACL } from "../src/acl/index.js";
+import { Vertex } from "../src/hashgraph/index.js";
 import {
 	ACLGroup,
 	DRP,
@@ -995,3 +996,47 @@ describe("Hash validation tests", () => {
 		);
 	});
 });
+
+describe("HashGraph hook tests", () => {
+	let obj1: DRPObject;
+	let obj2: DRPObject;
+	beforeEach(async () => {
+		obj1 = new DRPObject({ peerId: "peer1", acl, drp: new SetDRP<number>() });
+		obj2 = new DRPObject({ peerId: "peer1", acl, drp: new SetDRP<number>() });
+	});
+
+	test("New operations are hooked from callFn", () => {
+		const drp1 = obj1.drp as SetDRP<number>;
+		const newVertices: Vertex[] = [];
+
+		obj1.subscribe((object, origin, vertices) => {
+			if (origin === "callFn") {
+				newVertices.push(...vertices);
+			}
+		});
+		for (let i = 1; i < 100; i++) {
+			drp1.add(i);
+			expect(newVertices.length).toBe(i);
+			expect(newVertices[i - 1].operation?.opType).toBe("add");
+			expect(newVertices[i - 1].operation?.value[0]).toBe(i);
+		}
+	});
+
+	test("Merged operations are hooked from merge", () => {
+		const drp1 = obj1.drp as SetDRP<number>;
+		const newVertices: Vertex[] = [];
+
+		obj2.subscribe((object, origin, vertices) => {
+			if (origin === "merge") {
+				newVertices.push(...vertices);
+			}
+		});
+		for (let i = 1; i < 100; i++) {
+			drp1.add(i);
+			obj2.merge(obj1.hashGraph.getAllVertices());
+			expect(newVertices.length).toBe(i);
+			expect(newVertices[i - 1].operation?.opType).toBe("add");
+			expect(newVertices[i - 1].operation?.value[0]).toBe(i);
+		}
+	});
+});