# Mar

## v4.0 - Self-Hosted

**18 Mar, 2026**

## What's New in This Release

- **New installations:** Deploy controller v4.0 as a fresh install on **Amazon EKS**, **Google GKE**, or an **air-gapped** controller.
- **Upgrades:** Supported upgrade path from **v3.8** to **v4.0** for EKS-based, GKE-based, and air-gapped controllers.

For feature-level detail, see the **[v4.0 SaaS release notes](https://docs.rafay.co/releasenotes/2026/jan/#v40-saas)**.