diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2fc44366..01f61e90 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## master / unreleased
 
 * [FEATURE] Add a parquet labels cache. #621
+* [DEPENDENCY] update quay.io/cortexproject/cortex docker tag to v1.21.0 #622
 * [DEPENDENCY] update kiwigrid/k8s-sidecar docker tag to v2.7.1 #623
 
 ## 3.2.1 / 2026-04-20
diff --git a/Chart.yaml b/Chart.yaml
index 77328177..3388e72a 100644
--- a/Chart.yaml
+++ b/Chart.yaml
@@ -1,6 +1,6 @@
 apiVersion: v2
 version: 3.2.1
-appVersion: v1.20.1
+appVersion: v1.21.0
 description: 'Horizontally scalable, highly available, multi-tenant, long term Prometheus.'
 home: https://cortexmetrics.io/
 icon: https://avatars2.githubusercontent.com/u/43045022?s=200&v=4
diff --git a/README.md b/README.md
index 8e237b69..933d93d7 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 # cortex
 
-![Version: 3.2.1](https://img.shields.io/badge/Version-3.2.1-informational?style=flat-square) ![AppVersion: v1.20.1](https://img.shields.io/badge/AppVersion-v1.20.1-informational?style=flat-square)
+![Version: 3.2.1](https://img.shields.io/badge/Version-3.2.1-informational?style=flat-square) ![AppVersion: v1.21.0](https://img.shields.io/badge/AppVersion-v1.21.0-informational?style=flat-square)
 
 Horizontally scalable, highly available, multi-tenant, long term Prometheus.