diff --git a/argocd/manifests/databases/blumeops-pg.yaml b/argocd/manifests/databases/blumeops-pg.yaml
index 73e2236..ea68c9b 100644
--- a/argocd/manifests/databases/blumeops-pg.yaml
+++ b/argocd/manifests/databases/blumeops-pg.yaml
@@ -7,7 +7,7 @@ metadata:
   namespace: databases
 spec:
   instances: 1
-  imageName: ghcr.io/cloudnative-pg/postgresql:18
+  imageName: ghcr.io/cloudnative-pg/postgresql:18.3
 
   storage:
     size: 10Gi
diff --git a/docs/changelog.d/blumeops-pg-18.3.infra.md b/docs/changelog.d/blumeops-pg-18.3.infra.md
new file mode 100644
index 0000000..f5ecb65
--- /dev/null
+++ b/docs/changelog.d/blumeops-pg-18.3.infra.md
@@ -0,0 +1 @@
+Pin blumeops-pg to PostgreSQL 18.3 (from floating `:18` tag at 18.1)
diff --git a/service-versions.yaml b/service-versions.yaml
index 7e3984c..d64f8d3 100644
--- a/service-versions.yaml
+++ b/service-versions.yaml
@@ -124,10 +124,10 @@ services:
 
   - name: blumeops-pg
     type: argocd
-    last-reviewed: null
-    current-version: null
+    last-reviewed: 2026-02-27
+    current-version: "18.3"
     upstream-source: https://github.com/cloudnative-pg/cloudnative-pg/releases
-    notes: CloudNativePG Cluster resource
+    notes: CloudNativePG Cluster resource; pinned to PG minor version
 
   - name: authentik
     type: argocd