diff --git a/docs/_releasenotes/1995.change.thanos-updated-to-17.2.6 b/docs/_releasenotes/1995.change.thanos-updated-to-17.2.6
new file mode 100644
index 0000000000000000000000000000000000000000..6aa7e1a09b8501d5bef8bc5492a9f214213b7452
--- /dev/null
+++ b/docs/_releasenotes/1995.change.thanos-updated-to-17.2.6
@@ -0,0 +1 @@
+Updated default version of helm chart thanos of https://github.com/bitnami/charts from 17.2.3 to 17.2.6
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 7abaf76d2985f79a9a456f58323b56dbdfa6631f..b5e1312dcb1415021e2110be60831a0caace067a 100644
--- a/docs/user/reference/options/yk8s.k8s-service-layer.prometheus.rst
+++ b/docs/user/reference/options/yk8s.k8s-service-layer.prometheus.rst
@@ -1637,7 +1637,7 @@ If the version shall be unpinned, set to: ``null``.
 
 **Default:**::
 
-  "17.2.3"
+  "17.2.6"
 
 
 **Example:**::
diff --git a/nix/yk8s/k8s-supplements/monitoring.nix b/nix/yk8s/k8s-supplements/monitoring.nix
index 4fc02aed91b180b0f7136b0487286d800c67e17b..5ba5b0b546463d48afb269bfb620021492f1d90b 100644
--- a/nix/yk8s/k8s-supplements/monitoring.nix
+++ b/nix/yk8s/k8s-supplements/monitoring.nix
@@ -360,7 +360,7 @@ in {
 
     thanos_chart_version = mkHelmChartVersionOption {
       # renovate: datasource=helm depName=thanos registryUrl=https://charts.bitnami.com/bitnami
-      default = "17.2.3";
+      default = "17.2.6";
     };
 
     thanos_storage_class = mkOption {