diff --git a/README.md b/README.md
index e289568e1..723fd1c8d 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/c8f542a
-[addon-doc-bookstack]: https://github.com/hassio-addons/addon-bookstack/blob/c8f542a/README.md
+[addon-bookstack]: https://github.com/hassio-addons/addon-bookstack/tree/cbb6a16
+[addon-doc-bookstack]: https://github.com/hassio-addons/addon-bookstack/blob/cbb6a16/README.md
 [bookstack-issue]: https://github.com/hassio-addons/addon-bookstack/issues
-[bookstack-version-shield]: https://img.shields.io/badge/version-c8f542a-blue.svg
+[bookstack-version-shield]: https://img.shields.io/badge/version-cbb6a16-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 f860c2364..864e42536 100644
--- a/bookstack/CHANGELOG.md
+++ b/bookstack/CHANGELOG.md
@@ -1,4 +1,5 @@
 # Changelog since v0.12.1
+- ⬆ Update Bookstack to v21.08.3. (#137) 
 - ✨ Add options for setting and displaying Appkey (#136)
 
 * ✨ Add show_appkey option
diff --git a/bookstack/README.md b/bookstack/README.md
index 0cb6dc21d..80a551043 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-c8f542a-blue.svg
-[release]: https://github.com/hassio-addons/addon-bookstack/tree/c8f542a
+[release-shield]: https://img.shields.io/badge/version-cbb6a16-blue.svg
+[release]: https://github.com/hassio-addons/addon-bookstack/tree/cbb6a16
 [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 0c4bf2f06..701f6ec49 100644
--- a/bookstack/config.json
+++ b/bookstack/config.json
@@ -1,6 +1,6 @@
 {
   "name": "Bookstack",
-  "version": "c8f542a",
+  "version": "cbb6a16",
   "slug": "bookstack",
   "description": "Simple & Free Wiki Software",
   "url": "https://github.com/hassio-addons/addon-bookstack",