diff --git a/base_requirements.txt b/base_requirements.txt
index 34958fd3a..dddd405da 100644
--- a/base_requirements.txt
+++ b/base_requirements.txt
@@ -30,6 +30,10 @@ django-graphiql-debug-toolbar
 # https://github.com/matthiask/django-tree-queries/blob/main/CHANGELOG.rst
 django-tree-queries
 
+# Modified Preorder Tree Traversal (recursive nesting of objects)
+# https://github.com/django-mptt/django-mptt/blob/main/CHANGELOG.rst
+django-mptt
+
 # Context managers for PostgreSQL advisory locks
 # https://github.com/Xof/django-pglocks/blob/master/CHANGES.txt
 django-pglocks
diff --git a/requirements.txt b/requirements.txt
index 9a501ea15..ca0c42596 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,6 +5,7 @@ django-cors-headers==3.14.0
 django-debug-toolbar==4.0.0
 django-filter==23.2
 django-graphiql-debug-toolbar==0.2.0
+django-mptt==0.14
 django-pglocks==1.0.4
 django-prometheus==2.3.1
 django-redis==5.2.0