# Medusa v1.20.4 — Release & Upgrade Intelligence
- **Product:** Medusa (https://medusajs.com)
- **Version:** v1.20.4
- **Released:** Mar 26, 2024
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/medusajs/updates/v1.20.4/

## Executive Summary (TL;DR)
Medusa v1.20.4. Source highlight: Introducing Worker Mode

## New Features
- `server`: API Routes are registered, and no workers are started.
- `worker`: API Routes are not registered, and workers are started.
- `shared`: API routes are registered, and workers are started (the regular runtime mode + default).
- feat: Update the signatures for variants and options to follow convention
- feat(fulfillment): Events management
- feat: Init. v2 implementation in admin

## Bug Fixes
- Feat(user): Invite expiration fix
- fix(orchestration): Properly handle select all
- fix(link-modules): recreate dismissed link
- fix: revert no server start
- fix: make module test runner configurable
- fix(medusa-oas-cli): fix tool not working in Medusa backends