diff --git a/app/models/forms/bulk_upload_lettings/prepare_your_file.rb b/app/models/forms/bulk_upload_lettings/prepare_your_file.rb
index 9a2d71af4..bfaa622b2 100644
--- a/app/models/forms/bulk_upload_lettings/prepare_your_file.rb
+++ b/app/models/forms/bulk_upload_lettings/prepare_your_file.rb
@@ -30,7 +30,7 @@ module Forms
       end
 
       def specification_path
-        "/files/Lettings 2022-23 Bulk Upload Specification.csv"
+        "/files/bulk-upload-lettings-specification-2022-23.xlsx"
       end
 
       def year_combo
diff --git a/app/models/forms/bulk_upload_sales/prepare_your_file.rb b/app/models/forms/bulk_upload_sales/prepare_your_file.rb
index 3b3ddce94..52d70a85c 100644
--- a/app/models/forms/bulk_upload_sales/prepare_your_file.rb
+++ b/app/models/forms/bulk_upload_sales/prepare_your_file.rb
@@ -28,7 +28,7 @@ module Forms
       end
 
       def specification_path
-        "/files/Sales 2022-23 Bulk Upload Specification.csv"
+        "/files/bulk-upload-sales-specification-2022-23.xlsx"
       end
 
       def year_combo
diff --git a/public/files/Lettings 2022-23 Bulk Upload Specification.csv b/public/files/bulk-upload-lettings-specification-2022-23.xlsx
similarity index 100%
rename from public/files/Lettings 2022-23 Bulk Upload Specification.csv
rename to public/files/bulk-upload-lettings-specification-2022-23.xlsx
diff --git a/public/files/Sales 2022-23 Bulk Upload Specification.csv b/public/files/bulk-upload-sales-specification-2022-23.xlsx
similarity index 100%
rename from public/files/Sales 2022-23 Bulk Upload Specification.csv
rename to public/files/bulk-upload-sales-specification-2022-23.xlsx