diff --git a/.release-please-manifest-beta.json b/.release-please-manifest-beta.json
index f8826b5c..a02a741d 100644
--- a/.release-please-manifest-beta.json
+++ b/.release-please-manifest-beta.json
@@ -1,3 +1,3 @@
 {
-  ".": "3.21.0-beta.0"
+  ".": "3.21.1-beta.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 81f1a833..6f7372d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,13 @@ All notable changes to PicPeak will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.21.1-beta.0](https://github.com/the-luap/picpeak/compare/v3.21.0-beta.0...v3.21.1-beta.0) (2026-03-22)
+
+
+### Bug Fixes
+
+* address Shannon security assessment findings (37 vulnerabilities) ([#254](https://github.com/the-luap/picpeak/issues/254)) ([23cd9cb](https://github.com/the-luap/picpeak/commit/23cd9cb680eb77b94a97266c3353dfc835f0cc69))
+
 ## [3.21.0-beta.0](https://github.com/the-luap/picpeak/compare/v3.20.1-beta.0...v3.21.0-beta.0) (2026-03-18)
 
 
diff --git a/backend/package.json b/backend/package.json
index 5c802be5..13923034 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "picpeak-backend",
-  "version": "3.21.0-beta.0",
+  "version": "3.21.1-beta.0",
   "description": "Backend for PicPeak event photo sharing platform",
   "main": "server.js",
   "scripts": {
diff --git a/frontend/package.json b/frontend/package.json
index a1865404..55ed0708 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,7 +1,7 @@
 {
   "name": "picpeak-frontend",
   "private": true,
-  "version": "3.21.0-beta.0",
+  "version": "3.21.1-beta.0",
   "type": "module",
   "scripts": {
     "dev": "vite",