diff --git a/docs/api/requirements.txt b/docs/api/requirements.txt
index 1be1024f..bdacb34b 100644
--- a/docs/api/requirements.txt
+++ b/docs/api/requirements.txt
@@ -1,3 +1,6 @@
+--extra-index-url https://wheels.vtk.org
+vtk==9.3.20240817.dev0
+
 pygments
 sphinx
 sphinx-rtd-theme