diff --git a/README.md b/README.md
index 652d64833..52d45fe10 100644
--- a/README.md
+++ b/README.md
@@ -746,10 +746,10 @@ SOFTWARE.
 [appdaemon-armhf-shield]: https://img.shields.io/badge/armhf-yes-green.svg
 [appdaemon-armv7-shield]: https://img.shields.io/badge/armv7-yes-green.svg
 [appdaemon-i386-shield]: https://img.shields.io/badge/i386-yes-green.svg
-[addon-bookstack]: https://github.com/hassio-addons/addon-bookstack/tree/b33eba9
-[addon-doc-bookstack]: https://github.com/hassio-addons/addon-bookstack/blob/b33eba9/README.md
+[addon-bookstack]: https://github.com/hassio-addons/addon-bookstack/tree/4c971b4
+[addon-doc-bookstack]: https://github.com/hassio-addons/addon-bookstack/blob/4c971b4/README.md
 [bookstack-issue]: https://github.com/hassio-addons/addon-bookstack/issues
-[bookstack-version-shield]: https://img.shields.io/badge/version-b33eba9-blue.svg
+[bookstack-version-shield]: https://img.shields.io/badge/version-4c971b4-blue.svg
 [bookstack-aarch64-shield]: https://img.shields.io/badge/aarch64-yes-green.svg
 [bookstack-amd64-shield]: https://img.shields.io/badge/amd64-yes-green.svg
 [bookstack-armhf-shield]: https://img.shields.io/badge/armhf-yes-green.svg
diff --git a/bookstack/CHANGELOG.md b/bookstack/CHANGELOG.md
index 74c7c9b22..055c4c9db 100644
--- a/bookstack/CHANGELOG.md
+++ b/bookstack/CHANGELOG.md
@@ -1,4 +1,5 @@
 # Changelog since v0.13.0
+- ⬆️ Update Bookstack to v21.08.5 (#147) 
 - ⬆️ Upgrades add-on base image to 10.1.1 (#145) 
 - ⬆️ Upgrades composer to 2.1.9-r0 (#144) 
 - ⬆️ Upgrades php7 to 7.4.24-r0 (#143) 
diff --git a/bookstack/README.md b/bookstack/README.md
index a7495c0a7..5955b2aff 100644
--- a/bookstack/README.md
+++ b/bookstack/README.md
@@ -42,6 +42,6 @@ If you are more interested in stable releases of our add-ons:
 [forum]: https://community.home-assistant.io/?u=frenck
 [maintenance-shield]: https://img.shields.io/maintenance/yes/2021.svg
 [project-stage-shield]: https://img.shields.io/badge/project%20stage-experimental-yellow.svg
-[release-shield]: https://img.shields.io/badge/version-b33eba9-blue.svg
-[release]: https://github.com/hassio-addons/addon-bookstack/tree/b33eba9
+[release-shield]: https://img.shields.io/badge/version-4c971b4-blue.svg
+[release]: https://github.com/hassio-addons/addon-bookstack/tree/4c971b4
 [screenshot]: https://github.com/hassio-addons/addon-bookstack/raw/main/images/screenshot.png
\ No newline at end of file
diff --git a/bookstack/config.json b/bookstack/config.json
index 8a6f87c1f..e8ec1b160 100644
--- a/bookstack/config.json
+++ b/bookstack/config.json
@@ -1,6 +1,6 @@
 {
   "name": "Bookstack",
-  "version": "b33eba9",
+  "version": "4c971b4",
   "slug": "bookstack",
   "description": "Simple & Free Wiki Software",
   "url": "https://github.com/hassio-addons/addon-bookstack",