diff --git a/charts/Chart.lock b/charts/Chart.lock
index a2a8c70..5c37846 100644
--- a/charts/Chart.lock
+++ b/charts/Chart.lock
@@ -4,6 +4,6 @@ dependencies:
   version: 0.108.0
 - name: postgresql
   repository: https://charts.bitnami.com/bitnami
-  version: 16.4.3
-digest: sha256:0f95fd5e5f69ad8ca9412c19303f0be457f456c6395769e8f5c9b3dd12da77a7
-generated: "2026-02-28T22:31:07.7391604+01:00"
+  version: 18.5.1
+digest: sha256:21ebf5483087d6bcf6e3dd74c79075768b4cb71af542e993a6f1fb7ca9abe223
+generated: "2026-02-28T21:36:20.574501929Z"
diff --git a/charts/Chart.yaml b/charts/Chart.yaml
index 6aed0ba..89d0261 100644
--- a/charts/Chart.yaml
+++ b/charts/Chart.yaml
@@ -25,6 +25,6 @@ dependencies:
   # PostgreSQL — enabled for local dev via values.local.yaml.
   # In production, disable this and supply the connection string via a Secret.
   - name: postgresql
-    version: "16.4.3"
+    version: 18.5.1
     repository: https://charts.bitnami.com/bitnami
     condition: postgresql.enabled