diff --git a/pyproject.toml b/pyproject.toml
index 9695383..f11f073 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,6 +45,7 @@ docs = [
     "nbformat>=5.10.4",
     "quarto-cli>=1.8.25",
     "quartodoc>=0.11.1",
+    "griffe<2", # used by quartodoc
 ]
 
 [project.urls]