diff --git a/pyproject.toml b/pyproject.toml
index 12de60e..e5f48ac 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,6 +46,7 @@ test = [
     "pytest!=8.1.0",
     "pytest-order",
     "pytest-xdist",
+    "tomli-w",
     "GitPython",
     "pooch",
     "scipy",