---
title: "Kubernetes Notification: Update cert-manager to prevent SSL invalidation"
description: Let's Encrypt notifies customers that they will start blocking older cert-manager versions as of November 1.
---

[Articles ](https://www.ironstoneit.com/en/articles)

# [Kubernetes Notification: Update cert-manager to prevent SSL invalidation](https://www.ironstoneit.com/en/articles/kubernetes-notification-update-cert-manager)

 Written by [The Ironstone Team](https://www.ironstoneit.com/en/articles/author/the-ironstone-team) | Sep 5, 2019 12:25:49 PM

**Let's Encrypt notifies customers that they will start blocking older cert-manager versions as of November 1.**

If you are using cert-manager versions older than 0.8.0, they will start to block all traffic from these versions and result in your SSL certificates not working. Cert-manager 0.9.0 is already released and should be updated immediately. 

 

**Affected systems: ** 

- [Kubernetes](https://www.ironstoneit.com/blog/kubernetes-guide-why-and-how-to-use) Cluster 
- Cert-manager  

**  
If you have deployed cert-manager with Helm**

Most people are familiar with Helm and the deployment of cert-manager through helm charts. And you can easily check if you are affected by typing “**Helm list | grep cert-manager**” and see what version you are running.  

 

 

**Mitigation:**

- Upgrade cert-manager to version 0.9.0 or newer and don’t forget to back-up in case something breaks during the upgrade. 

You can find a [**guide**](https://docs.cert-manager.io/en/latest/tasks/upgrading/index.html) on upgrading cert-manager **[here >](https://docs.cert-manager.io/en/latest/tasks/upgrading/index.html)**

Release notes: **[https://github.com/jetstack/cert-manager/releases](https://github.com/jetstack/cert-manager/releases)**  

Helm chart: **[https://hub.helm.sh/charts/jetstack/cert-manager](https://hub.helm.sh/charts/jetstack/cert-manager)** 

 

**You can read more about it here:** 

[https://community.letsencrypt.org/t/blocking-old-cert-manager-versions/98753](https://community.letsencrypt.org/t/blocking-old-cert-manager-versions/98753) 

[https://github.com/jetstack/cert-manager/issues/1948](https://github.com/jetstack/cert-manager/issues/1948) 

 

 

[View full post](https://www.ironstoneit.com/en/articles/kubernetes-notification-update-cert-manager)

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