diff --git a/.github/workflows/ci-scheduled.yaml b/.github/workflows/ci-scheduled.yaml
index 1acad0b..c4afa24 100644
--- a/.github/workflows/ci-scheduled.yaml
+++ b/.github/workflows/ci-scheduled.yaml
@@ -28,10 +28,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - k8s-version: v1.17.5
-            stack-version: v1.3
-          - k8s-version: v1.18.8
-            stack-version: v1.3
           - k8s-version: v1.19.7
             stack-version: v1.3
           - k8s-version: v1.20.2
diff --git a/README.md b/README.md
index 397d8cc..08ad733 100644
--- a/README.md
+++ b/README.md
@@ -48,8 +48,6 @@ If you're experiencing issues please read the [documentation](https://dnationclo
 
 ||dNation monitoring v1.3|dNation monitoring v1.4|dNation monitoring v2.0|dNation monitoring v2.3|dNation monitoring v2.5|
 |-|-|-|-|-|-|
-|Kubernetes v1.17|✓|||||
-|Kubernetes v1.18|✓|||||
 |Kubernetes v1.19|✓|||||
 |Kubernetes v1.20|✓|||||
 |Kubernetes v1.21||✓|✓|||
diff --git a/chart/Chart.yaml b/chart/Chart.yaml
index fb7e025..225cc1c 100644
--- a/chart/Chart.yaml
+++ b/chart/Chart.yaml
@@ -15,7 +15,7 @@
 
 apiVersion: v2
 name: dnation-kubernetes-monitoring-stack
-version: 3.2.0
+version: 3.3.0
 appVersion: 2.5.3  # dnation-kubernetes-monitoring
 description: An umbrella helm chart for Kubernetes monitoring based on kube-prometheus-stack, thanos, loki, loki-distributed, promtail and dnation-kubernetes-monitoring.
 keywords:
@@ -33,7 +33,7 @@ sources:
 - https://github.com/dNationCloud/kubernetes-monitoring-stack
 dependencies:
 - name: kube-prometheus-stack
-  version: "45.10.*"
+  version: "53.0.*"
   repository: https://prometheus-community.github.io/helm-charts
   condition: kube-prometheus-stack.enabled
 - name: thanos
diff --git a/chart/values.yaml b/chart/values.yaml
index 815ba73..7c83197 100644
--- a/chart/values.yaml
+++ b/chart/values.yaml
@@ -212,6 +212,7 @@ kube-prometheus-stack:
       ##
       thanos:
         logLevel: info
+        objectStorageConfig: {}
     thanosService:
       enabled: true
 
diff --git a/multicluster-config/observer-values-openshift.yaml b/multicluster-config/observer-values-openshift.yaml
index bab9a82..3804e39 100644
--- a/multicluster-config/observer-values-openshift.yaml
+++ b/multicluster-config/observer-values-openshift.yaml
@@ -156,8 +156,9 @@ kube-prometheus-stack:
       replicas: 2
       thanos:
         objectStorageConfig:
-          name: thanos-objstore-config
-          key: objstore.yml
+          existingSecret:
+            name: thanos-objstore-config
+            key: objstore.yml
     thanosService:
       enabled: true
 
diff --git a/multicluster-config/observer-values.yaml b/multicluster-config/observer-values.yaml
index 807a873..e43f0a1 100644
--- a/multicluster-config/observer-values.yaml
+++ b/multicluster-config/observer-values.yaml
@@ -134,7 +134,8 @@ kube-prometheus-stack:
       replicas: 2
       thanos:
         objectStorageConfig:
-          name: thanos-objstore-config
-          key: objstore.yml
+          existingSecret:
+            name: thanos-objstore-config
+            key: objstore.yml
     thanosService:
       enabled: true
diff --git a/multicluster-config/workload-values-openshift.yaml b/multicluster-config/workload-values-openshift.yaml
index 27c5a97..f845dbe 100644
--- a/multicluster-config/workload-values-openshift.yaml
+++ b/multicluster-config/workload-values-openshift.yaml
@@ -62,8 +62,9 @@ kube-prometheus-stack:
       replicas: 2
       thanos:
         objectStorageConfig:
-          name: thanos-objstore-config
-          key: objstore.yml
+          existingSecret:
+            name: thanos-objstore-config
+            key: objstore.yml
     thanosService:
       enabled: true
 
diff --git a/multicluster-config/workload-values.yaml b/multicluster-config/workload-values.yaml
index 733247f..ff5b896 100644
--- a/multicluster-config/workload-values.yaml
+++ b/multicluster-config/workload-values.yaml
@@ -44,8 +44,9 @@ kube-prometheus-stack:
       replicas: 2
       thanos:
         objectStorageConfig:
-          name: thanos-objstore-config
-          key: objstore.yml
+          existingSecret:
+            name: thanos-objstore-config
+            key: objstore.yml
     thanosService:
       enabled: true