diff --git a/book/_toc.yml b/book/_toc.yml
index 67d9bd6..368cada 100644
--- a/book/_toc.yml
+++ b/book/_toc.yml
@@ -3,7 +3,7 @@ root: intro.md
 
 parts:
   - caption: Thesis Projects
-    :maxdepth: 1
+    depth: 1
     chapters: 
     - file: thesis_projects/BSc/overview_BSc_thesis_projects.md
       sections: