diff --git a/docs/requirements.txt b/docs/requirements.txt
index 1c98a36..1a6863e 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -7,3 +7,4 @@ sphinx-argparse-cli>=1.17.0
 # We don't want to introduce pdm and the other tooling in the CI.
 dasbus
 requests
+PyGObject