diff --git a/requirements/doc.txt b/requirements/doc.txt
index 660588a..7752e4e 100644
--- a/requirements/doc.txt
+++ b/requirements/doc.txt
@@ -166,6 +166,7 @@ python-dateutil==2.8.2
 pytz==2023.3.post1
     # via
     #   -r requirements/test.txt
+    #   babel
     #   django
     #   djangorestframework
 pyyaml==6.0.1