diff --git a/CHANGELOG.md b/CHANGELOG.md
index c56ffcc2..94b47cd7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 * [FEATURE] Add trafficDistribution attribute to services #674
 * [ENHANCEMENT] Update helm values and documentation for rollout operator #673
 * [DEPENDENCY] Update Helm release rollout-operator to v0.52.0 #670
+* [DEPENDENCY] Update kiwigrid/k8s-sidecar docker tag to v2.13.3 #677
 
 ## 3.4.0 / 2026-09-21
 
diff --git a/README.md b/README.md
index 310f920b..138d5472 100644
--- a/README.md
+++ b/README.md
@@ -147,7 +147,7 @@ Kubernetes: `^1.19.0-0`
 | alertmanager.​sidecar.​healthPort | int | `8081` | The port the kiwigrid/k8s-sidecar listens on for health checks. The image default matches the cortex default listen port (8080), so it must be overridden here. |
 | alertmanager.​sidecar.​image.​repository | string | `"kiwigrid/k8s-sidecar"` |  |
 | alertmanager.​sidecar.​image.​sha | string | `""` |  |
-| alertmanager.​sidecar.​image.​tag | string | `"2.11.2"` |  |
+| alertmanager.​sidecar.​image.​tag | string | `"2.13.3"` |  |
 | alertmanager.​sidecar.​imagePullPolicy | string | `"IfNotPresent"` |  |
 | alertmanager.​sidecar.​label | string | `"cortex_alertmanager"` | Label that should be used for filtering |
 | alertmanager.​sidecar.​labelValue | string | `""` | The value for the label you want to filter your resources on. Don't set a value to filter by any value |
@@ -874,7 +874,7 @@ Kubernetes: `^1.19.0-0`
 | ruler.​sidecar.​healthPort | int | `8081` | The port the kiwigrid/k8s-sidecar listens on for health checks. The image default matches the cortex default listen port (8080), so it must be overridden here. |
 | ruler.​sidecar.​image.​repository | string | `"kiwigrid/k8s-sidecar"` |  |
 | ruler.​sidecar.​image.​sha | string | `""` |  |
-| ruler.​sidecar.​image.​tag | string | `"2.11.2"` |  |
+| ruler.​sidecar.​image.​tag | string | `"2.13.3"` |  |
 | ruler.​sidecar.​imagePullPolicy | string | `"IfNotPresent"` |  |
 | ruler.​sidecar.​label | string | `"cortex_rules"` | label that the configmaps with rules are marked with |
 | ruler.​sidecar.​labelValue | string | `""` | The value for the label you want to filter your resources on. Don't set a value to filter by any value |
diff --git a/values.yaml b/values.yaml
index 3093fae2..4b2fd7e8 100644
--- a/values.yaml
+++ b/values.yaml
@@ -284,7 +284,7 @@ alertmanager:
     enabled: false
     image:
       repository: kiwigrid/k8s-sidecar
-      tag: 2.11.2
+      tag: 2.13.3
       sha: ""
     imagePullPolicy: IfNotPresent
     resources: {}
@@ -737,7 +737,7 @@ ruler:
     enabled: false
     image:
       repository: kiwigrid/k8s-sidecar
-      tag: 2.11.2
+      tag: 2.13.3
       sha: ""
     imagePullPolicy: IfNotPresent
     resources: {}