diff --git a/setup.cfg b/setup.cfg
index f7f952e20..fb7533f91 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -84,6 +84,7 @@ docs =
     autodoc-pydantic
     m2r2
     pygraphviz
+    pyobo
     mock
     wget
 sbml =