diff --git a/requirements/requirements-optionals.txt b/requirements/requirements-optionals.txt
index bac597c953..78ac9bcdf6 100644
--- a/requirements/requirements-optionals.txt
+++ b/requirements/requirements-optionals.txt
@@ -4,6 +4,7 @@ coreschema==0.0.4
 django-filter
 django-guardian>=2.4.0,<2.5
 inflection==0.5.1
+legacy-cgi; python_version>="3.13"
 markdown>=3.3.7
 psycopg2-binary>=2.9.5,<2.10
 pygments~=2.17.0