diff --git a/CHANGELOG.md b/CHANGELOG.md
index 511a78d..eb6371f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,10 @@
 This file only reflects the changes that are made in this image.
 Please refer to the [Salt 3003.3 Release Notes](https://docs.saltstack.com/en/latest/topics/releases/3003.3.html) for the list of changes in SaltStack.
 
+**3004**
+
+- Change Docker base image to `ubuntu:focal-20211006`
+
 **3003.3**
 
 - Upgrade `salt-master` to `3003.3` *Aluminium*
diff --git a/Dockerfile b/Dockerfile
index 7856230..29bd388 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:focal-20210827
+FROM ubuntu:focal-20211006
 
 ARG BUILD_DATE
 ARG VCS_REF
diff --git a/README.md b/README.md
index d9b2f19..b23d245 100644
--- a/README.md
+++ b/README.md
@@ -579,7 +579,7 @@ Where `salt-service` is one of: `salt-master` os `salt-api` (if `SALT_API_SERVIC
 
 [saltproject_badge]: https://img.shields.io/badge/Salt-v3003.3-lightgrey.svg?logo=Saltstack
 [saltproject_release_notes]: https://docs.saltproject.io/en/latest/topics/releases/3003.3.html "Salt Project Release Notes"
-[ubuntu_badge]: https://img.shields.io/badge/ubuntu-focal--20210827-E95420.svg?logo=Ubuntu
+[ubuntu_badge]: https://img.shields.io/badge/ubuntu-focal--20211006-E95420.svg?logo=Ubuntu
 [ubuntu_hub_docker]: https://hub.docker.com/_/ubuntu/ "Ubuntu Image"
 [github_publish_badge]: https://img.shields.io/github/workflow/status/cdalvaro/docker-salt-master/Publish%20Docker%20image?label=build&logo=GitHub&logoColor=%23181717
 [github_publish_workflow]: https://github.com/cdalvaro/docker-salt-master/actions?query=workflow%3A%22Publish+Docker+image%22