diff --git a/docs/_releasenotes/2187.BREAKING.kube-prometheus-stack-updated-to-79.12.0 b/docs/_releasenotes/2187.BREAKING.kube-prometheus-stack-updated-to-79.12.0
new file mode 100644
index 0000000000000000000000000000000000000000..45049597e13d590fde0180aa9309cac75a7a4ead
--- /dev/null
+++ b/docs/_releasenotes/2187.BREAKING.kube-prometheus-stack-updated-to-79.12.0
@@ -0,0 +1 @@
+Updated default version of helm chart kube-prometheus-stack of https://github.com/prometheus-community/helm-charts from 78.5.0 to 79.12.0
diff --git a/docs/user/reference/options/yk8s.k8s-service-layer.prometheus.rst b/docs/user/reference/options/yk8s.k8s-service-layer.prometheus.rst
index 9701313b4b5a1a2c0541cd6f12736d4357b2932f..ddaa9b9277671666b7d725e761f1463e240e3360 100644
--- a/docs/user/reference/options/yk8s.k8s-service-layer.prometheus.rst
+++ b/docs/user/reference/options/yk8s.k8s-service-layer.prometheus.rst
@@ -1493,7 +1493,7 @@ If the version shall be unpinned, set to: ``null``.
 
 **Default:**::
 
-  "78.5.0"
+  "79.12.0"
 
 
 **Example:**::
diff --git a/nix/yk8s/k8s-supplements/monitoring.nix b/nix/yk8s/k8s-supplements/monitoring.nix
index 78ea623cb094c804e3acf0c61d5c0ed435f9f040..bf2e9cbef449b99e552b8cb0c081e1c384440439 100644
--- a/nix/yk8s/k8s-supplements/monitoring.nix
+++ b/nix/yk8s/k8s-supplements/monitoring.nix
@@ -254,7 +254,7 @@ in {
     };
     prometheus_stack_version = mkHelmChartVersionOption {
       # renovate: datasource=helm depName=kube-prometheus-stack registryUrl=https://prometheus-community.github.io/helm-charts
-      default = "78.5.0";
+      default = "79.12.0";
     };
     prometheus_adapter_version = mkHelmChartVersionOption {
       # renovate: datasource=helm depName=prometheus-adapter registryUrl=https://prometheus-community.github.io/helm-charts