diff --git a/charts/prometheus/Chart.lock b/charts/prometheus/Chart.lock
index 7f5ea908418e..a8d936570054 100644
--- a/charts/prometheus/Chart.lock
+++ b/charts/prometheus/Chart.lock
@@ -1,7 +1,7 @@
 dependencies:
 - name: alertmanager
   repository: https://prometheus-community.github.io/helm-charts
-  version: 1.19.0
+  version: 1.20.1
 - name: kube-state-metrics
   repository: https://prometheus-community.github.io/helm-charts
   version: 5.33.2
@@ -11,5 +11,5 @@ dependencies:
 - name: prometheus-pushgateway
   repository: https://prometheus-community.github.io/helm-charts
   version: 3.3.0
-digest: sha256:364b7da2903466baff2efc6651a9a299a5e7ac2bd6caa1de60b9351ff8157bb5
-generated: "2025-05-30T17:05:50.633479519Z"
+digest: sha256:8731bf2c5cf78dcad4c18c76bd41bcc1dcff00465a62aea49eada8f0b51e53e4
+generated: "2025-05-31T20:25:19.346034071Z"
diff --git a/charts/prometheus/Chart.yaml b/charts/prometheus/Chart.yaml
index 89d3c0b81b05..00850b86ef62 100644
--- a/charts/prometheus/Chart.yaml
+++ b/charts/prometheus/Chart.yaml
@@ -1,8 +1,8 @@
 apiVersion: v2
 name: prometheus
 # renovate: github=prometheus/prometheus
-appVersion: v3.4.0
-version: 27.17.0
+appVersion: v3.4.1
+version: 27.18.0
 kubeVersion: ">=1.19.0-0"
 description: Prometheus is a monitoring system and time series database.
 home: https://prometheus.io/
@@ -32,7 +32,7 @@ maintainers:
 type: application
 dependencies:
   - name: alertmanager
-    version: "1.19.*"
+    version: "1.20.*"
     repository: https://prometheus-community.github.io/helm-charts
     condition: alertmanager.enabled
   - name: kube-state-metrics