diff --git a/cove_iati/tests_functional.py b/cove_iati/tests_functional.py
index 554e579b..49751fc7 100644
--- a/cove_iati/tests_functional.py
+++ b/cove_iati/tests_functional.py
@@ -168,9 +168,9 @@ def check_url_input_result_page(server_url, browser, httpserver, source_filename
     if source_filename == 'namespace_good.xlsx':
         converted_file = browser.find_element(By.LINK_TEXT, "XML (Converted from Original)").get_attribute("href")
         assert requests.get(converted_file).text == '''<?xml version='1.0' encoding='utf-8'?>
-<iati-activities>
+<iati-activities xmlns:myns="http://example.org">
   <!--Data generated by IATI CoVE. Built by Open Data Services Co-operative: http://iati.cove.opendataservices.coop/-->
-  <iati-activity xmlns:myns="http://example.org" myns:test2="3">
+  <iati-activity myns:test2="3">
     <myns:test>1</myns:test>
     <test2>2</test2>
   </iati-activity>
diff --git a/requirements.in b/requirements.in
index 24dadb9a..26637537 100644
--- a/requirements.in
+++ b/requirements.in
@@ -1,6 +1,6 @@
 Django>4.2,<4.3
 #^^ rq.filter: <1.12
-flattentool>=0.17.2
+flattentool
 libcove
 libcoveweb
 django-bootstrap3
diff --git a/requirements.txt b/requirements.txt
index 4295aade..0df59b68 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -60,7 +60,7 @@ django-environ==0.11.2
     # via -r requirements.in
 et-xmlfile==1.1.0
     # via openpyxl
-flattentool==0.25.0
+flattentool==0.26.0
     # via
     #   -r requirements.in
     #   libcove
diff --git a/requirements_dev.txt b/requirements_dev.txt
index 1dd83a76..6c4192f7 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -109,7 +109,7 @@ execnet==2.1.1
     # via pytest-xdist
 flake8==7.1.1
     # via -r requirements_dev.in
-flattentool==0.25.0
+flattentool==0.26.0
     # via
     #   -r requirements.txt
     #   libcove