diff --git a/Chart.lock b/Chart.lock
index 6b2ab8c..789f20f 100644
--- a/Chart.lock
+++ b/Chart.lock
@@ -1,7 +1,7 @@
 dependencies:
 - name: postgresql
   repository: oci://registry-1.docker.io/bitnamicharts
-  version: 16.7.27
+  version: 18.2.3
 - name: postgresql-ha
   repository: oci://registry-1.docker.io/bitnamicharts
   version: 16.3.2
@@ -11,5 +11,5 @@ dependencies:
 - name: valkey
   repository: oci://registry-1.docker.io/bitnamicharts
   version: 3.0.31
-digest: sha256:ceb6a1890cfdc2627abb85d3e2a4baa64d30afd21dcfabce978a824a67f0a2bb
-generated: "2025-08-30T00:03:04.59764502Z"
+digest: sha256:03c9c6adc63065fc3800b46fef519a571f8af16a78b97b2d3efd6353a03b8ef8
+generated: "2026-01-19T21:01:24.927789265Z"
diff --git a/Chart.yaml b/Chart.yaml
index b438797..20a375e 100644
--- a/Chart.yaml
+++ b/Chart.yaml
@@ -32,7 +32,7 @@ dependencies:
   # https://github.com/bitnami/charts/blob/main/bitnami/postgresql
   - name: postgresql
     repository: oci://registry-1.docker.io/bitnamicharts
-    version: 16.7.27
+    version: 18.2.3
     condition: postgresql.enabled
   # https://github.com/bitnami/charts/blob/main/bitnami/postgresql-ha/Chart.yaml
   - name: postgresql-ha
diff --git a/unittests/helm/dependency-checks/major-image-bump.yaml b/unittests/helm/dependency-checks/major-image-bump.yaml
index ce2a531..38af40e 100644
--- a/unittests/helm/dependency-checks/major-image-bump.yaml
+++ b/unittests/helm/dependency-checks/major-image-bump.yaml
@@ -28,7 +28,7 @@ tests:
         matchRegex:
           path: spec.template.spec.containers[0].image
           # IN CASE OF AN INTENTIONAL MAJOR BUMP, ADJUST THIS TEST
-          pattern: bitnamilegacy/postgresql:17.+$
+          pattern: bitnamilegacy/postgresql:(18.+$|latest)
   - it: "[valkey-cluster] ensures we detect major image version upgrades"
     template: charts/valkey-cluster/templates/valkey-statefulset.yaml
     set: