diff --git a/charts/mastodon/Chart.yaml b/charts/mastodon/Chart.yaml
index 9da8fa5fecb2c212dd5ef59705605bfd8c820978..f016f2f54894abcde96f9bb9fffd0f05b81dd8b2 100644
--- a/charts/mastodon/Chart.yaml
+++ b/charts/mastodon/Chart.yaml
@@ -17,10 +17,10 @@ annotations:
     - name: support
       url: https://matrix.to/#/#mastodon-on-kubernetes:shivering-isles.com
 type: application
-version: 8.1.1
+version: 9.0.0
 kubeVersion: ">= 1.23"
 # renovate: image=ghcr.io/mastodon/mastodon
-appVersion: "v4.1.10"
+appVersion: "v4.2.1"
 
 dependencies:
   - name: postgresql
diff --git a/charts/mastodon/README.md b/charts/mastodon/README.md
index cb48c1a30396123b35a30dcb12a0ec7e687552bf..3b1c687372506dcb1e2acb77e4d5ee96e9f0f635 100644
--- a/charts/mastodon/README.md
+++ b/charts/mastodon/README.md
@@ -1,6 +1,6 @@
 # mastodon
 
-![Version: 8.1.1](https://img.shields.io/badge/Version-8.1.1-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: v4.1.10](https://img.shields.io/badge/AppVersion-v4.1.10-informational?style=flat-square)
+![Version: 9.0.0](https://img.shields.io/badge/Version-9.0.0-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: v4.2.1](https://img.shields.io/badge/AppVersion-v4.2.1-informational?style=flat-square)
 
 Mastodon is a free, open-source social network server based on ActivityPub.