diff --git a/scripts/build_trucking_campaigns.py b/scripts/build_trucking_campaigns.py
index d459290..4a9e10f 100644
--- a/scripts/build_trucking_campaigns.py
+++ b/scripts/build_trucking_campaigns.py
@@ -433,8 +433,24 @@ def add_subscriber(list_id: int, email: str, name: str, attribs: dict) -> bool:
                     if status != "enabled":
                         LOG.info("Listmonk suppressed existing subscriber %s status=%s", email, status or "unknown")
                         return False
+                    sub_id = results[0]["id"]
+                    # Refresh attribs so per-campaign merge fields (coupon code,
+                    # ifta_due_date, lp_link, etc.) are correct for THIS send --
+                    # otherwise a previously-imported carrier keeps stale attribs
+                    # and the new campaign renders blank fields.
+                    try:
+                        merged = dict(results[0].get("attribs") or {})
+                        merged.update(attribs or {})
+                        lm_api(f"/subscribers/{sub_id}", {
+                            "email": email,
+                            "name": name or results[0].get("name") or email,
+                            "status": "enabled",
+                            "attribs": merged,
+                        }, "PUT")
+                    except Exception:
+                        pass  # non-fatal: still attach to the list below
                     lm_api("/subscribers/lists", {
-                        "ids": [results[0]["id"]],
+                        "ids": [sub_id],
                         "action": "add",
                         "target_list_ids": [list_id],
                         "status": "confirmed",