diff --git a/CHANGELOG.md b/CHANGELOG.md
index 444aa17b..a0dcf8d4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## master / unreleased
 
+* [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/README.md b/README.md
index 3d71fb0c..d7b00a10 100644
--- a/README.md
+++ b/README.md
@@ -145,7 +145,7 @@ 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 | `"2.7.1"` |  |
+| alertmanager.​sidecar.​image.​tag | string | `"2.7.3"` |  |
 | 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 |
@@ -852,7 +852,7 @@ 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 | `"2.7.1"` |  |
+| ruler.​sidecar.​image.​tag | string | `"2.7.3"` |  |
 | 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 28d6f4d0..fee10862 100644
--- a/values.yaml
+++ b/values.yaml
@@ -283,7 +283,7 @@ alertmanager:
     enabled: false
     image:
       repository: kiwigrid/k8s-sidecar
-      tag: 2.7.1
+      tag: 2.7.3
       sha: ""
     imagePullPolicy: IfNotPresent
     resources: {}
@@ -712,7 +712,7 @@ ruler:
     enabled: false
     image:
       repository: kiwigrid/k8s-sidecar
-      tag: 2.7.1
+      tag: 2.7.3
       sha: ""
     imagePullPolicy: IfNotPresent
     resources: {}