diff --git a/CHANGELOG.md b/CHANGELOG.md
index a0dcf8d4..26bad297 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## master / unreleased
 
+## 3.3.1 / 2026-05-21
+
 * [DEPENDENCY] update kiwigrid/k8s-sidecar docker tag to v2.7.3 #628
 * [DEPENDENCY] update nginx docker tag to v1.31 #629
 * [DEPENDENCY] update memcached docker tag to v1.6.42 #631
diff --git a/Chart.yaml b/Chart.yaml
index d75c4632..583033cc 100644
--- a/Chart.yaml
+++ b/Chart.yaml
@@ -1,5 +1,5 @@
 apiVersion: v2
-version: 3.3.0
+version: 3.3.1
 appVersion: v1.21.0
 description: 'Horizontally scalable, highly available, multi-tenant, long term Prometheus.'
 home: https://cortexmetrics.io/
diff --git a/README.md b/README.md
index d7b00a10..769beeb6 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 # cortex
 
-![Version: 3.3.0](https://img.shields.io/badge/Version-3.3.0-informational?style=flat-square) ![AppVersion: v1.21.0](https://img.shields.io/badge/AppVersion-v1.21.0-informational?style=flat-square)
+![Version: 3.3.1](https://img.shields.io/badge/Version-3.3.1-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.
 
diff --git a/docs/cortex-3.3.1.tgz b/docs/cortex-3.3.1.tgz
new file mode 100644
index 00000000..546a3497
Binary files /dev/null and b/docs/cortex-3.3.1.tgz differ
diff --git a/docs/index.yaml b/docs/index.yaml
index 2cfa174d..7f956f76 100644
--- a/docs/index.yaml
+++ b/docs/index.yaml
@@ -3,7 +3,55 @@ entries:
   cortex:
   - apiVersion: v2
     appVersion: v1.21.0
-    created: "2026-04-27T18:05:02.971458825Z"
+    created: "2026-05-21T01:14:12.921801856Z"
+    dependencies:
+    - alias: memcached-frontend
+      condition: memcached-frontend.enabled
+      name: memcached
+      repository: https://charts.bitnami.com/bitnami
+      version: 6.14.0
+    - alias: memcached-blocks-index
+      condition: memcached-blocks-index.enabled
+      name: memcached
+      repository: https://charts.bitnami.com/bitnami
+      version: 6.14.0
+    - alias: memcached-blocks
+      condition: memcached-blocks.enabled
+      name: memcached
+      repository: https://charts.bitnami.com/bitnami
+      version: 6.14.0
+    - alias: memcached-blocks-metadata
+      condition: memcached-blocks-metadata.enabled
+      name: memcached
+      repository: https://charts.bitnami.com/bitnami
+      version: 6.14.0
+    - alias: memcached-parquet-labels
+      condition: memcached-parquet-labels.enabled
+      name: memcached
+      repository: https://charts.bitnami.com/bitnami
+      version: 6.14.0
+    description: Horizontally scalable, highly available, multi-tenant, long term
+      Prometheus.
+    digest: d78913504745162e5c7165b17e19ec7b6da931865de191bcc9c7cac2804131d8
+    home: https://cortexmetrics.io/
+    icon: https://avatars2.githubusercontent.com/u/43045022?s=200&v=4
+    kubeVersion: ^1.19.0-0
+    maintainers:
+    - email: thayward@infoblox.com
+      name: Tom Hayward
+      url: https://github.com/kd7lxl
+    - email: niclas.schad@stackit.cloud
+      name: Niclas Schad
+      url: https://github.com/nschad
+    name: cortex
+    sources:
+    - https://github.com/cortexproject/cortex-helm-chart
+    urls:
+    - https://cortexproject.github.io/cortex-helm-chart/cortex-3.3.1.tgz
+    version: 3.3.1
+  - apiVersion: v2
+    appVersion: v1.21.0
+    created: "2026-05-21T01:14:12.914049046Z"
     dependencies:
     - alias: memcached-frontend
       condition: memcached-frontend.enabled
@@ -51,7 +99,7 @@ entries:
     version: 3.3.0
   - apiVersion: v2
     appVersion: v1.20.1
-    created: "2026-04-27T18:05:02.964113667Z"
+    created: "2026-05-21T01:14:12.906110823Z"
     dependencies:
     - alias: memcached-frontend
       condition: memcached-frontend.enabled
@@ -94,7 +142,7 @@ entries:
     version: 3.2.1
   - apiVersion: v2
     appVersion: v1.20.1
-    created: "2026-04-27T18:05:02.957074794Z"
+    created: "2026-05-21T01:14:12.898615686Z"
     dependencies:
     - alias: memcached-frontend
       condition: memcached-frontend.enabled
@@ -137,7 +185,7 @@ entries:
     version: 3.2.0
   - apiVersion: v2
     appVersion: v1.20.1
-    created: "2026-04-27T18:05:02.949297113Z"
+    created: "2026-05-21T01:14:12.891236544Z"
     dependencies:
     - alias: memcached-frontend
       condition: memcached-frontend.enabled
@@ -180,7 +228,7 @@ entries:
     version: 3.1.0
   - apiVersion: v2
     appVersion: v1.20.0
-    created: "2026-04-27T18:05:02.942120992Z"
+    created: "2026-05-21T01:14:12.884627897Z"
     dependencies:
     - alias: memcached-frontend
       condition: memcached-frontend.enabled
@@ -223,7 +271,7 @@ entries:
     version: 3.0.0
   - apiVersion: v2
     appVersion: v1.19.0
-    created: "2026-04-27T18:05:02.934506674Z"
+    created: "2026-05-21T01:14:12.877391415Z"
     dependencies:
     - alias: memcached-frontend
       condition: memcached-frontend.enabled
@@ -266,7 +314,7 @@ entries:
     version: 2.6.0
   - apiVersion: v2
     appVersion: v1.18.1
-    created: "2026-04-27T18:05:02.928136201Z"
+    created: "2026-05-21T01:14:12.870212303Z"
     dependencies:
     - alias: memcached-frontend
       condition: memcached-frontend.enabled
@@ -309,7 +357,7 @@ entries:
     version: 2.5.0
   - apiVersion: v2
     appVersion: v1.17.1
-    created: "2026-04-27T18:05:02.920980976Z"
+    created: "2026-05-21T01:14:12.864102457Z"
     dependencies:
     - alias: memcached-frontend
       condition: memcached-frontend.enabled
@@ -352,7 +400,7 @@ entries:
     version: 2.4.0
   - apiVersion: v2
     appVersion: v1.16.0
-    created: "2026-04-27T18:05:02.913927778Z"
+    created: "2026-05-21T01:14:12.857289332Z"
     dependencies:
     - alias: memcached-frontend
       condition: memcached-frontend.enabled
@@ -395,7 +443,7 @@ entries:
     version: 2.3.0
   - apiVersion: v2
     appVersion: v1.16.0
-    created: "2026-04-27T18:05:02.906615253Z"
+    created: "2026-05-21T01:14:12.850510759Z"
     dependencies:
     - alias: memcached-frontend
       condition: memcached-frontend.enabled
@@ -438,7 +486,7 @@ entries:
     version: 2.2.0
   - apiVersion: v2
     appVersion: v1.14.1
-    created: "2026-04-27T18:05:02.900508403Z"
+    created: "2026-05-21T01:14:12.844205638Z"
     dependencies:
     - alias: memcached-frontend
       condition: memcached-frontend.enabled
@@ -481,7 +529,7 @@ entries:
     version: 2.1.0
   - apiVersion: v2
     appVersion: v1.14.1
-    created: "2026-04-27T18:05:02.893417778Z"
+    created: "2026-05-21T01:14:12.837488243Z"
     dependencies:
     - alias: memcached-frontend
       condition: memcached-frontend.enabled
@@ -524,7 +572,7 @@ entries:
     version: 2.0.1
   - apiVersion: v2
     appVersion: v1.14.0
-    created: "2026-04-27T18:05:02.886477631Z"
+    created: "2026-05-21T01:14:12.830634066Z"
     dependencies:
     - alias: memcached-frontend
       condition: memcached-frontend.enabled
@@ -564,7 +612,7 @@ entries:
     version: 2.0.0
   - apiVersion: v2
     appVersion: v1.13.0
-    created: "2026-04-27T18:05:02.879854717Z"
+    created: "2026-05-21T01:14:12.823777896Z"
     dependencies:
     - alias: memcached
       condition: memcached.enabled
@@ -625,7 +673,7 @@ entries:
     version: 1.7.0
   - apiVersion: v2
     appVersion: v1.11.1
-    created: "2026-04-27T18:05:02.873825834Z"
+    created: "2026-05-21T01:14:12.817564303Z"
     dependencies:
     - alias: memcached
       condition: memcached.enabled
@@ -686,7 +734,7 @@ entries:
     version: 1.6.0
   - apiVersion: v2
     appVersion: v1.11.1
-    created: "2026-04-27T18:05:02.866962947Z"
+    created: "2026-05-21T01:14:12.810791193Z"
     dependencies:
     - alias: memcached
       condition: memcached.enabled
@@ -747,7 +795,7 @@ entries:
     version: 1.5.1
   - apiVersion: v2
     appVersion: v1.11.1
-    created: "2026-04-27T18:05:02.860244583Z"
+    created: "2026-05-21T01:14:12.804163918Z"
     dependencies:
     - alias: memcached
       condition: memcached.enabled
@@ -808,7 +856,7 @@ entries:
     version: 1.5.0
   - apiVersion: v2
     appVersion: v1.11.1
-    created: "2026-04-27T18:05:02.854431413Z"
+    created: "2026-05-21T01:14:12.798422806Z"
     dependencies:
     - alias: memcached
       condition: memcached.enabled
@@ -869,7 +917,7 @@ entries:
     version: 1.4.0
   - apiVersion: v2
     appVersion: v1.11.0
-    created: "2026-04-27T18:05:02.848087216Z"
+    created: "2026-05-21T01:14:12.792033589Z"
     dependencies:
     - alias: memcached
       condition: memcached.enabled
@@ -930,7 +978,7 @@ entries:
     version: 1.3.0
   - apiVersion: v2
     appVersion: v1.11.0
-    created: "2026-04-27T18:05:02.841776829Z"
+    created: "2026-05-21T01:14:12.785889647Z"
     dependencies:
     - alias: memcached
       condition: memcached.enabled
@@ -991,7 +1039,7 @@ entries:
     version: 1.2.0
   - apiVersion: v2
     appVersion: v1.10.0
-    created: "2026-04-27T18:05:02.836289118Z"
+    created: "2026-05-21T01:14:12.78012526Z"
     dependencies:
     - alias: memcached
       condition: memcached.enabled
@@ -1052,7 +1100,7 @@ entries:
     version: 1.1.0
   - apiVersion: v2
     appVersion: v1.10.0
-    created: "2026-04-27T18:05:02.82950085Z"
+    created: "2026-05-21T01:14:12.773197377Z"
     dependencies:
     - alias: memcached
       condition: memcached.enabled
@@ -1113,7 +1161,7 @@ entries:
     version: 1.0.1
   - apiVersion: v2
     appVersion: v1.10.0
-    created: "2026-04-27T18:05:02.822940244Z"
+    created: "2026-05-21T01:14:12.7665988Z"
     dependencies:
     - alias: memcached
       condition: memcached.enabled
@@ -1174,7 +1222,7 @@ entries:
     version: 1.0.0
   - apiVersion: v2
     appVersion: v1.10.0
-    created: "2026-04-27T18:05:02.816481335Z"
+    created: "2026-05-21T01:14:12.76036035Z"
     dependencies:
     - alias: memcached
       condition: memcached.enabled
@@ -1235,7 +1283,7 @@ entries:
     version: 0.7.0
   - apiVersion: v2
     appVersion: v1.9.0
-    created: "2026-04-27T18:05:02.810230633Z"
+    created: "2026-05-21T01:14:12.753951208Z"
     dependencies:
     - alias: memcached
       condition: memcached.enabled
@@ -1292,7 +1340,7 @@ entries:
     version: 0.6.0
   - apiVersion: v2
     appVersion: v1.9.0
-    created: "2026-04-27T18:05:02.805007427Z"
+    created: "2026-05-21T01:14:12.748734726Z"
     dependencies:
     - alias: memcached
       condition: memcached.enabled
@@ -1349,7 +1397,7 @@ entries:
     version: 0.5.0
   - apiVersion: v2
     appVersion: v1.7.0
-    created: "2026-04-27T18:05:02.800480635Z"
+    created: "2026-05-21T01:14:12.744167181Z"
     dependencies:
     - alias: memcached
       condition: memcached.enabled
@@ -1405,7 +1453,7 @@ entries:
     version: 0.4.1
   - apiVersion: v2
     appVersion: v1.7.0
-    created: "2026-04-27T18:05:02.796180767Z"
+    created: "2026-05-21T01:14:12.739906718Z"
     dependencies:
     - alias: memcached
       condition: memcached.enabled
@@ -1461,7 +1509,7 @@ entries:
     version: 0.4.0
   - apiVersion: v2
     appVersion: v1.6.0
-    created: "2026-04-27T18:05:02.792142289Z"
+    created: "2026-05-21T01:14:12.736264135Z"
     dependencies:
     - alias: memcached
       condition: memcached.enabled
@@ -1517,7 +1565,7 @@ entries:
     version: 0.3.0
   - apiVersion: v2
     appVersion: v1.4.0
-    created: "2026-04-27T18:05:02.787777991Z"
+    created: "2026-05-21T01:14:12.732461191Z"
     dependencies:
     - alias: memcached
       condition: memcached.enabled
@@ -1548,4 +1596,4 @@ entries:
     urls:
     - https://cortexproject.github.io/cortex-helm-chart/cortex-0.2.0.tgz
     version: 0.2.0
-generated: "2026-04-27T18:05:02.77750679Z"
+generated: "2026-05-21T01:14:12.723689263Z"