diff --git a/requirements.txt b/requirements.txt
index fe8a2c1..f436294 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,6 +3,7 @@ flake8
 # rst_include tool as GitHub doesn't support `.. include::` when rendering
 # previews.
 rst_include
+docutils
 
 # The Python API for the SkyWater PDK.
 -e scripts/python-skywater-pdk