diff --git a/src/lib/services/brochures.service.ts b/src/lib/services/brochures.service.ts
index 9df5be3..c13204d 100644
--- a/src/lib/services/brochures.service.ts
+++ b/src/lib/services/brochures.service.ts
@@ -178,7 +178,7 @@ export async function updateBrochure(
     const [row] = await tx
       .update(brochures)
       .set(updates)
-      .where(eq(brochures.id, brochureId))
+      .where(and(eq(brochures.id, brochureId), eq(brochures.portId, portId)))
       .returning();
     if (!row)
       throw new CodedError('INSERT_RETURNING_EMPTY', {
@@ -196,7 +196,7 @@ export async function archiveBrochure(portId: string, brochureId: string): Promi
   await db
     .update(brochures)
     .set({ archivedAt: new Date(), isDefault: false })
-    .where(eq(brochures.id, brochureId));
+    .where(and(eq(brochures.id, brochureId), eq(brochures.portId, portId)));
 }
 
 // ─── Versions ────────────────────────────────────────────────────────────────