diff --git a/store/models.py b/store/models.py
index 47bb055..f0933ca 100644
--- a/store/models.py
+++ b/store/models.py
@@ -577,12 +577,17 @@ class Checklist(models.Model):
             if old_obj and self.status != old_obj.status:
                 self.status_updated_at = timezone.now()
 
+            # Invalidate old CDEK barcode PDF
+            if self.cdek_tracking != old_obj.cdek_tracking:
+                self.cdek_barcode_pdf.delete(save=False)
+                self.cdek_barcode_pdf = None
+
             # Try to get CDEK barcode PDF
             if not self.cdek_barcode_pdf and self.cdek_tracking and self.status in Checklist.Status.PDF_AVAILABLE_STATUSES:
                 from store.views import CDEKAPI
                 pdf_file = CDEKAPI.client.get_barcode_file(self.cdek_tracking)
                 if pdf_file:
-                    self.cdek_barcode_pdf.save(f'{self.id}_barcode.pdf', pdf_file)
+                    self.cdek_barcode_pdf.save(f'{self.id}_barcode.pdf', pdf_file, save=False)
 
             # Create preview image
             if not self.preview_image: