---
title: System Requirements
toc_order: 3
---

# System Requirements

Following are the version requirements for components on which Kontena depends:

* **Kontena CLI:** Ruby 2.0 or later
  * **Local Image Builds (optional):** Docker 1.9.x or later
  * **VPN (optional):** OpenVPN client
* **Kontena Master:** Docker 1.9.x - 1.12.x
* **Kontena Agent:** Docker 1.9.x - 1.12.x
