diff --git a/docs/DESIGN.md b/docs/DESIGN.md
index 9678945..252bc50 100644
--- a/docs/DESIGN.md
+++ b/docs/DESIGN.md
@@ -33,7 +33,7 @@ MVP - Minimum Viable Product Task List
 - [x] Create SDL Worker Install to $SDL_HOME
 - [x] SDL Install Script
 - [ ] Create SDL Worker Auto Update Process
-- [ ] Create Worker Join Process
+- [x] Create Worker Join Process
 - [ ] Create Worker Telementry Process
 - [ ] Data Storage Organizational Structure
 - [ ] MinIO S3 Storage Server
diff --git a/sdl-mgr/app/modules/sdl-mgr/index.js b/sdl-mgr/app/modules/sdl-mgr/index.js
index df07199..9d1a3ba 100644
--- a/sdl-mgr/app/modules/sdl-mgr/index.js
+++ b/sdl-mgr/app/modules/sdl-mgr/index.js
@@ -8,6 +8,7 @@ import fs from 'fs';
 import path from 'path';
 
 
+
 const config = load_config();
 
 log(`Loaded module: ${module}`);
@@ -343,6 +344,32 @@ function startSDLStatusPub() {
 }
 
 function publishStatus(client, topic) {
+  //get ip addr
+  const interfaces = os.networkInterfaces();
+  let ip_addr = null;
+
+  for (const [iface, addrs] of Object.entries(interfaces)) {
+    for (const addr of addrs) {
+      // --- FILTERS ---
+
+      // IPv4 only
+      if (addr.family !== 'IPv4') continue;
+
+      // Skip loopback
+      if (addr.internal === true) continue;
+
+      // Skip /32 networks (no broadcast: e.g. Tailscale)
+      const cidr = Number(addr.cidr?.split('/')[1]);
+      if (!Number.isInteger(cidr) || cidr >= 32) continue;
+
+      // Compute broadcast address
+      const broadcastAddr = computeBroadcast(addr.address, addr.netmask);
+      if (!broadcastAddr) continue;
+
+      ip_addr = addr.address
+    }
+  }
+
   const status = {
     ts: new Date().toISOString(),
     sdl_id: config.identity.sdl_id,
@@ -352,7 +379,8 @@ function publishStatus(client, topic) {
     msg: {
       sdl: {
         version: config.package.version,
-        uptime: getUptimeDHMS()
+        uptime: getUptimeDHMS(),
+        update_cmd: `curl -s http://${ip_addr}:${config.modules.web.port}/dist/install-sdl-wkr.sh | bash -s ${ip_addr}`
       },
       cluster: config.cluster,
       modules: Object.fromEntries(
diff --git a/sdl-wkr/app/modules/sdl-wkr/index.js b/sdl-wkr/app/modules/sdl-wkr/index.js
index 9b12ce2..bb6dddd 100644
--- a/sdl-wkr/app/modules/sdl-wkr/index.js
+++ b/sdl-wkr/app/modules/sdl-wkr/index.js
@@ -3,6 +3,8 @@ import { load_config, log } from '../nwa-lib/index.js';
 import dgram from 'dgram';
 import mqtt from 'mqtt';
 import os from 'os';
+import { exec } from 'child_process';
+
 
 const config = load_config();
 
@@ -12,8 +14,10 @@ log(`Loaded module: ${module}`);
 // Worker state
 // -------------------------------
 let joined = false;
+let authorized = false;
 let mqttClient = null;
 let clusterConfig = null;
+let updating = false;
 
 // -------------------------------
 // Start UDP discovery
@@ -172,13 +176,23 @@ function joinCluster(mqttInfo, cluster) {
 // Handle MQTT messages
 // -------------------------------
 function handleMqttMessage(topic, message) {
+
   try {
     const payload = JSON.parse(message.toString());
     const mqttTopics = clusterConfig.modules.mqtt.topics[module];
     
-    if (topic === mqttTopics.sub['sdl_join-authz']) {
-      handleJoinAuthz(payload);
-    }
+  if (topic === mqttTopics.sub['sdl_join-authz']) {
+    handleJoinAuthz(payload);
+    return;
+  }
+
+  if (
+    authorized &&
+    topic === mqttTopics.sub['sdl_cluster-status']
+  ) {
+    handleClusterStatus(payload);
+  }
+
   } catch (err) {
     log(`${module}: failed to parse MQTT message: ${err}`);
   }
@@ -195,11 +209,63 @@ function handleJoinAuthz(payload) {
 
   if (payload.msg?.authorized === true) {
     log(`${module}: join authorized by cluster`);
+    authorized = true;
+
+    const mqttTopics = clusterConfig.modules.mqtt.topics[module];
+    const statusTopic = mqttTopics.sub['sdl_cluster-status'];
+
+    mqttClient.subscribe(statusTopic, { qos: 1 }, err => {
+      if (err) {
+        log(`${module}: failed to subscribe to ${statusTopic}: ${err}`);
+      } else {
+        log(`${module}: subscribed to ${statusTopic}`);
+      }
+    });
   } else {
     log(`${module}: join denied: ${payload.msg?.reason || 'unknown'}`);
   }
 }
 
+function handleClusterStatus(payload) {
+  const clusterVersion = payload.msg?.sdl?.version;
+  const updateCmd = payload.msg?.sdl?.update_cmd;
+  const localVersion = config.package.version;
+
+  if (!clusterVersion) return;
+
+  if (clusterVersion !== localVersion) {
+    log(
+      `${module}: version mismatch detected (cluster=${clusterVersion}, local=${localVersion})`
+    );
+    triggerWorkerUpdate(clusterVersion, updateCmd);
+  }
+}
+
+
+function triggerWorkerUpdate(targetVersion, updateCmd) {
+  if (updating) return;
+  updating = true;
+
+  log(
+    `${module}: triggering self-update to SDL version ${targetVersion}`
+  );
+
+  // Stop reacting to further control messages
+  authorized = false;
+
+  try {
+    exec(updateCmd, { stdio: 'inherit' });
+  } catch (err) {
+    log(`${module}: failed to exec update command: ${err}`);
+    return;
+  }
+
+  log(`${module}: exiting for self-update`);
+  process.exit(0);
+}
+
+
+
 // -------------------------------
 // Entry point
 // -------------------------------