diff --git a/.release-please-manifest-beta.json b/.release-please-manifest-beta.json
index d776a001..f8826b5c 100644
--- a/.release-please-manifest-beta.json
+++ b/.release-please-manifest-beta.json
@@ -1,3 +1,3 @@
 {
-  ".": "3.20.1-beta.0"
+  ".": "3.21.0-beta.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 820d51f9..81f1a833 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,18 @@ 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).
 
+## [3.21.0-beta.0](https://github.com/the-luap/picpeak/compare/v3.20.1-beta.0...v3.21.0-beta.0) (2026-03-18)
+
+
+### Features
+
+* add per-gallery thumbnail scale setting ([#172](https://github.com/the-luap/picpeak/issues/172)) ([#251](https://github.com/the-luap/picpeak/issues/251)) ([ee46088](https://github.com/the-luap/picpeak/commit/ee46088985ebbbb81d16e5bac23be2060c94397f))
+
+
+### Bug Fixes
+
+* wrap test email with standard email template ([#252](https://github.com/the-luap/picpeak/issues/252)) ([954a011](https://github.com/the-luap/picpeak/commit/954a0118bae5770c74f1e811e03b8fc702c70db2))
+
 ## [3.20.1-beta.0](https://github.com/the-luap/picpeak/compare/v3.20.0-beta.0...v3.20.1-beta.0) (2026-03-17)
 
 
diff --git a/backend/package.json b/backend/package.json
index 5db076cf..5c802be5 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "picpeak-backend",
-  "version": "3.20.1-beta.0",
+  "version": "3.21.0-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 84e36be6..a1865404 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,7 +1,7 @@
 {
   "name": "picpeak-frontend",
   "private": true,
-  "version": "3.20.1-beta.0",
+  "version": "3.21.0-beta.0",
   "type": "module",
   "scripts": {
     "dev": "vite",