diff --git a/README.md b/README.md
index 1b35135ce..0f9c2681f 100644
--- a/README.md
+++ b/README.md
@@ -755,10 +755,10 @@ SOFTWARE.
 [bitwarden-armhf-shield]: https://img.shields.io/badge/armhf-no-red.svg
 [bitwarden-armv7-shield]: https://img.shields.io/badge/armv7-yes-green.svg
 [bitwarden-i386-shield]: https://img.shields.io/badge/i386-no-red.svg
-[addon-bookstack]: https://github.com/hassio-addons/addon-bookstack/tree/3f4e854
-[addon-doc-bookstack]: https://github.com/hassio-addons/addon-bookstack/blob/3f4e854/README.md
+[addon-bookstack]: https://github.com/hassio-addons/addon-bookstack/tree/8644636
+[addon-doc-bookstack]: https://github.com/hassio-addons/addon-bookstack/blob/8644636/README.md
 [bookstack-issue]: https://github.com/hassio-addons/addon-bookstack/issues
-[bookstack-version-shield]: https://img.shields.io/badge/version-3f4e854-blue.svg
+[bookstack-version-shield]: https://img.shields.io/badge/version-8644636-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 879949517..ee4f6a4da 100644
--- a/bookstack/CHANGELOG.md
+++ b/bookstack/CHANGELOG.md
@@ -1,4 +1,5 @@
 # Changelog since v0.12.0
+- ⬆️ Upgrades BookStack to v21.05.3 (#118) 
 - ⬆️ Upgrades php7 to 7.4.21-r0 (#117) 
 - Bump docker/build-push-action from 2.5.0 to 2.6.1 (#112)
 
diff --git a/bookstack/README.md b/bookstack/README.md
index dd4553aef..74bf8c856 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-3f4e854-blue.svg
-[release]: https://github.com/hassio-addons/addon-bookstack/tree/3f4e854
+[release-shield]: https://img.shields.io/badge/version-8644636-blue.svg
+[release]: https://github.com/hassio-addons/addon-bookstack/tree/8644636
 [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 aa0a12a11..99c709bcf 100644
--- a/bookstack/config.json
+++ b/bookstack/config.json
@@ -1,6 +1,6 @@
 {
   "name": "Bookstack",
-  "version": "3f4e854",
+  "version": "8644636",
   "slug": "bookstack",
   "description": "Simple & Free Wiki Software",
   "url": "https://github.com/hassio-addons/addon-bookstack",