diff --git a/pyproject.toml b/pyproject.toml
index f1089e63..0190bad7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -60,6 +60,7 @@ optional-dependencies.dev = [
   "pytest",
   "pytest-django",
   "python-coveralls",
+  "setuptools",
 ]
 optional-dependencies.sankey = [
   "pysankeybeta~=1.3.0",