diff --git a/.release-please-manifest-beta.json b/.release-please-manifest-beta.json
index 34785653..a2bdc4ce 100644
--- a/.release-please-manifest-beta.json
+++ b/.release-please-manifest-beta.json
@@ -1,3 +1,3 @@
 {
-  ".": "3.90.2-beta.0"
+  ".": "3.91.0-beta.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 63997c75..76d41d45 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,19 @@ 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).
 
+## [3.91.0-beta.0](https://github.com/PicPeak/picpeak/compare/v3.90.2-beta.0...v3.91.0-beta.0) (2026-07-18)
+
+
+### Features
+
+* **uploads:** HEIC/HEIF support + dynamic format hint on guest upload ([#821](https://github.com/PicPeak/picpeak/issues/821)) ([ee9d2f7](https://github.com/PicPeak/picpeak/commit/ee9d2f70d3342d65edb795a688f0f5f611429964))
+
+
+### Bug Fixes
+
+* **gallery:** serve JPEG preview for non-displayable originals in lightbox (codex review of [#832](https://github.com/PicPeak/picpeak/issues/832)) ([808d305](https://github.com/PicPeak/picpeak/commit/808d3055497bb4e4a372acafa49ef9baf257f008))
+* **uploads:** register HEIC/HEIF with the file validator + fix admin format hint (codex review of [#832](https://github.com/PicPeak/picpeak/issues/832)) ([c9b64d9](https://github.com/PicPeak/picpeak/commit/c9b64d9c1a8744c9ee5e068366a500ae0dab36bc))
+
 ## [3.90.2-beta.0](https://github.com/PicPeak/picpeak/compare/v3.90.1-beta.0...v3.90.2-beta.0) (2026-07-17)
 
 
diff --git a/backend/package.json b/backend/package.json
index abb783a9..6f9a9c4f 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "picpeak-backend",
-  "version": "3.90.2-beta.0",
+  "version": "3.91.0-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 82e330e0..1b99e554 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,7 +1,7 @@
 {
   "name": "picpeak-frontend",
   "private": true,
-  "version": "3.90.2-beta.0",
+  "version": "3.91.0-beta.0",
   "type": "module",
   "scripts": {
     "dev": "vite",