diff --git a/CHANGELOG.md b/CHANGELOG.md
index e2b8da0d..7f6856c8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -29,7 +29,7 @@ _This release is scheduled to be released on 2025-01-01._
 
 ### Fixed
 
-- [updatenotification] Fix pm2 using detection when pm2 script is inside or outside MagicMirror root folder (#3576) (#3605) (#3626)
+- [updatenotification] Fix pm2 using detection when pm2 script is inside or outside MagicMirror root folder (#3576) (#3605) (#3626) (#3628)
 - [core] Fix loading node_helper of modules: avoid black screen, display errors and continue loading with next module (#3578)
 - [weather] Changed default value for weatherEndpoint of provider openweathermap to "/onecall" (#3574)
 - [tests] Fix electron tests with mock dates, the mock on server side was missing (#3597)
diff --git a/modules/default/updatenotification/update_helper.js b/modules/default/updatenotification/update_helper.js
index 89e8ddf7..fc7cc10b 100644
--- a/modules/default/updatenotification/update_helper.js
+++ b/modules/default/updatenotification/update_helper.js
@@ -1,7 +1,7 @@
 const Exec = require("node:child_process").exec;
 const Spawn = require("node:child_process").spawn;
 const fs = require("node:fs");
-const pm2 = require("pm2");
+
 const Log = require("logger");
 
 /*
@@ -47,8 +47,8 @@ class Updater {
 		this.autoRestart = config.updateAutorestart;
 		this.moduleList = {};
 		this.updating = false;
-		this.usePM2 = false;
-		this.PM2 = null;
+		this.usePM2 = false; // don't use pm2 by default
+		this.PM2Id = null; // pm2 process number
 		this.version = global.version;
 		this.root_path = global.root_path;
 		Log.info("updatenotification: Updater Class Loaded!");
@@ -139,10 +139,11 @@ class Updater {
 		else this.npmRestart();
 	}
 
-	// restart MagicMiror with "pm2"
+	// restart MagicMiror with "pm2": use PM2Id for restart it
 	pm2Restart () {
 		Log.info("updatenotification: PM2 will restarting MagicMirror...");
-		pm2.restart(this.PM2, (err, proc) => {
+		const pm2 = require("pm2");
+		pm2.restart(this.PM2Id, (err, proc) => {
 			if (err) {
 				Log.error("updatenotification:[PM2] restart Error", err);
 			}
@@ -155,7 +156,7 @@ class Updater {
 		const out = process.stdout;
 		const err = process.stderr;
 		const subprocess = Spawn("npm start", { cwd: this.root_path, shell: true, detached: true, stdio: ["ignore", out, err] });
-		subprocess.unref();
+		subprocess.unref(); // detach the newly launched process from the master process
 		process.exit();
 	}
 
@@ -165,49 +166,45 @@ class Updater {
 		return new Promise((resolve) => {
 			if (fs.existsSync("/.dockerenv")) {
 				Log.info("updatenotification: Running in docker container, not using PM2 ...");
-				this.usePM2 = false;
 				resolve(false);
 				return;
 			}
 
 			if (process.env.unique_id === undefined) {
 				Log.info("updatenotification: [PM2] You are not using pm2");
-				this.usePM2 = false;
 				resolve(false);
 				return;
 			}
 
 			Log.debug(`updatenotification: [PM2] Search for pm2 id: ${process.env.pm_id} -- name: ${process.env.name} -- unique_id: ${process.env.unique_id}`);
 
+			const pm2 = require("pm2");
 			pm2.connect((err) => {
 				if (err) {
 					Log.error("updatenotification: [PM2]", err);
-					this.usePM2 = false;
 					resolve(false);
 					return;
 				}
 				pm2.list((err, list) => {
 					if (err) {
 						Log.error("updatenotification: [PM2] Can't get process List!");
-						this.usePM2 = false;
 						resolve(false);
 						return;
 					}
 					list.forEach((pm) => {
 						Log.debug(`updatenotification: [PM2] found pm2 process id: ${pm.pm_id} -- name: ${pm.name} -- unique_id: ${pm.pm2_env.unique_id}`);
 						if (pm.pm2_env.status === "online" && process.env.name === pm.name && +process.env.pm_id === +pm.pm_id && process.env.unique_id === pm.pm2_env.unique_id) {
-							this.PM2 = pm.pm_id;
+							this.PM2Id = pm.pm_id;
 							this.usePM2 = true;
-							Log.info(`updatenotification: [PM2] You are using pm2 with id: ${this.PM2} (${pm.name})`);
+							Log.info(`updatenotification: [PM2] You are using pm2 with id: ${this.PM2Id} (${pm.name})`);
 							resolve(true);
 						} else {
 							Log.debug(`updatenotification: [PM2] pm2 process id: ${pm.pm_id} don't match...`);
 						}
 					});
 					pm2.disconnect();
-					if (!this.PM2) {
+					if (!this.usePM2) {
 						Log.info("updatenotification: [PM2] You are not using pm2");
-						this.usePM2 = false;
 						resolve(false);
 					}
 				});