diff --git a/manifest.fx.v3.json b/manifest.fx.v3.json
index 8f16e7bd6..dc95bc70b 100644
--- a/manifest.fx.v3.json
+++ b/manifest.fx.v3.json
@@ -1,7 +1,7 @@
 {
     "manifest_version": 3,
     "name": "Kiwix",
-    "version": "4.0.0",
+    "version": "4.0.1",
 
     "description": "Kiwix is an offline reader for content from Wikipedia, TED Talks, Stackexchange, and many other sources.",
     
diff --git a/manifest.json b/manifest.json
index b7b8444f0..fd8b8732e 100644
--- a/manifest.json
+++ b/manifest.json
@@ -2,7 +2,7 @@
     "manifest_version": 3,
     "name": "Kiwix JS Browser Extension",
     "short_name": "Kiwix JS",
-    "version": "4.0.0",
+    "version": "4.0.1",
 
     "description": "Kiwix is an offline reader for content from Wikipedia, TED Talks, Stackexchange, and many other sources.",
     
diff --git a/manifest.v2.json b/manifest.v2.json
index 1a71c41d1..d698f4a1b 100644
--- a/manifest.v2.json
+++ b/manifest.v2.json
@@ -1,7 +1,7 @@
 {
     "manifest_version": 2,
     "name": "Kiwix",
-    "version": "4.0.0",
+    "version": "4.0.1",
 
     "description": "Kiwix is an offline reader for content from Wikipedia, TED Talks, Stackexchange, and many other sources.",
     
diff --git a/manifest.webapp b/manifest.webapp
index e940ce7aa..1c3922713 100644
--- a/manifest.webapp
+++ b/manifest.webapp
@@ -1,5 +1,5 @@
 {
-  "version": "4.0.0",
+  "version": "4.0.1",
   "name": "Kiwix",
   "description": "Offline Wikipedia Viewer, and more",
   "launch_path": "/www/index.html",
diff --git a/package-lock.json b/package-lock.json
index b4cad5c38..4c1c9cead 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "kiwix-js",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "kiwix-js",
-      "version": "4.0.0",
+      "version": "4.0.1",
       "dependencies": {
         "@fortawesome/fontawesome-free": "5.9.0",
         "@types/fs-extra": "^9.0.11",
diff --git a/package.json b/package.json
index cd9ba546d..cbe8f87b9 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "kiwix-js",
   "productName": "Kiwix JS",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "description": "Kiwix is an offline reader for content from Wikipedia, TED Talks, Stackexchange, and many other sources.",
   "type": "module",
   "scripts": {
diff --git a/service-worker.js b/service-worker.js
index 97f19fbdc..5432d734d 100644
--- a/service-worker.js
+++ b/service-worker.js
@@ -33,7 +33,7 @@
  * download and install a new copy; we have to hard code this here because it is needed before any other file
  * is cached in APP_CACHE
  */
-const appVersion = '4.0.0';
+const appVersion = '4.0.1';
 
 /**
  * The name of the Cache API cache in which assets defined in regexpCachedContentTypes will be stored
diff --git a/ubuntu_touch/manifest.json b/ubuntu_touch/manifest.json
index ef8c4f0bc..30d621f9f 100644
--- a/ubuntu_touch/manifest.json
+++ b/ubuntu_touch/manifest.json
@@ -4,7 +4,7 @@
   "architecture": "all",
   "maintainer": "Kiwix team <contact+ubuntutouch@kiwix.org>",
   "framework": "ubuntu-sdk-16.04",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "title": "Kiwix",
   "hooks": {
     "kiwix": {
diff --git a/www/js/init.js b/www/js/init.js
index 776897659..e538e30b3 100644
--- a/www/js/init.js
+++ b/www/js/init.js
@@ -79,7 +79,7 @@ var params = {};
  * WARNING: Only change these parameters if you know what you are doing
  */
 // The current version number of this app
-params['appVersion'] = '4.0.0'; // **IMPORTANT** Ensure this is the same as the version number in service-worker.js
+params['appVersion'] = '4.0.1'; // **IMPORTANT** Ensure this is the same as the version number in service-worker.js
 // The PWA server (for use with the browser extensions in ServiceWorker mode)
 params['PWAServer'] = 'https://browser-extension.kiwix.org/current/'; // Include final slash!
 // params['PWAServer'] = 'https://kiwix.github.io/kiwix-js/'; // DEV: Uncomment this line for testing code on GitHub Pages