Helm 4.0: first major release in six years, with WebAssembly plugins

2025-11-12 · Publisher : Helm · Domain : Cloud & DevOps

On 12 November 2025, at KubeCon Atlanta, the Kubernetes package manager releases Helm 4, ten years after its creation: a new plugin system that can be written in WebAssembly, server-side apply support and an improved SDK.

### Background On 12 November 2025, the CNCF announces **Helm 4**, the Kubernetes package manager, at KubeCon + CloudNativeCon North America. It is the first major update in six years, released a few weeks after the project's tenth anniversary. Helm 4 keeps the familiar interface and behavior to limit disruption for current users. ### Key facts - **WebAssembly plugins**: extensions can be written in Wasm, making them portable across operating systems and architectures; traditional plugins keep working. - Support for **server-side apply** and targeting of modern Kubernetes versions. - Improved SDK: modern Go logging with multiple loggers, Helm commands embeddable in other applications. - Groundwork for future chart evolutions without breaking backward compatibility. - According to the CNCF, improvements touch test automation, chart signing, performance and chart distribution. ### Why it matters Helm remains the most common distribution format for Kubernetes applications. A major version means behavior changes to test in deployment pipelines, but the CNCF stresses continuity of use. For IT services firms, WebAssembly plugins are worth watching: the same plugin could run on workstations and CI agents regardless of operating system, simplifying shared tooling. The CNCF cites its 2024 survey: 40% of users name CI/CD complexity as a top challenge and 37% security as a barrier, which Helm 4 aims to reduce. ### Takeaway Helm 4 modernizes the Kubernetes package manager without breaking habits, with WebAssembly for plugins.

Tags : Kubernetes, Cloud natif, DevOps, WebAssembly, Open Source