# Ghost v4.9.0 — Release & Upgrade Intelligence
- **Product:** Ghost (https://ghost.org)
- **Version:** v4.9.0
- **Released:** Jul 07, 2021
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/ghost/updates/v4.9.0/

## Executive Summary (TL;DR)
Ghost v4.9.0. Source highlight: ✨ Added detection of conditional partials in themes - Naz

## New Features
- ✨ Added detection of conditional partials in themes - Naz
- ✨ Added webp image support (#13105) - Matt Hanley
- ✨ Added post feature image alt and caption support to editor (TryGhost/Admin#2026) - Kevin Ansfield
- ✨ Added `feature_image_{alt/caption}` to the v4 posts API - Kevin Ansfield
- ✨ Added alpha support for segmented email cards - Naz
- 🔒 Added email sent to admin for critical update check alerts - Naz

## Bug Fixes
- 🎨 Fixed account/dark mode/settings buttons not being accessible on small mobile devices - Kevin Ansfield
- 🐛 Fixed potential for partial content re-generation in 4.0 migrations (#13120) - Kevin Ansfield
- 🐛 Fixed incorrectly stored URLs after migration from 3.x to 4.6.1-4.8.4 (#13109) - Kevin Ansfield
- 🐛 Fixed a 500 error for incorrect fields parameter in API - Naz
- 🐛 Fixed blank mobile preview for pages in preview modal - Kevin Ansfield
- 🐛 Fixed validation on theme install API parameters - Daniel Lockyer