diff --git a/infra/argocd/applications/infisical-application.yaml b/infra/argocd/applications/infisical-application.yaml
index 7db4b4d..13a536a 100644
--- a/infra/argocd/applications/infisical-application.yaml
+++ b/infra/argocd/applications/infisical-application.yaml
@@ -17,6 +17,19 @@ spec:
   destination:
     server: https://kubernetes.default.svc
     namespace: infisical
+  # A StatefulSet's volumeClaimTemplates are immutable, and the API server
+  # injects fields into them that are not in the manifest (creationTimestamp,
+  # volumeMode, a status block). ArgoCD diffs those and reports OutOfSync
+  # forever, since syncing can never resolve them. infisical-postgres and
+  # infisical-valkey are the only StatefulSets here using volumeClaimTemplates,
+  # which is why this app alone was affected.
+  ignoreDifferences:
+    - group: apps
+      kind: StatefulSet
+      jqPathExpressions:
+        - '.spec.volumeClaimTemplates[]?.metadata.creationTimestamp'
+        - '.spec.volumeClaimTemplates[]?.spec.volumeMode'
+        - '.spec.volumeClaimTemplates[]?.status'
   syncPolicy:
     automated:
       prune: true