diff --git a/pyproject.toml b/pyproject.toml
index fc4bb1981..e95c6a2ee 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -72,7 +72,7 @@ mypy = "^0.971"
 types-protobuf = "^3.19.22"
 
 [build-system]
-requires = ["poetry-core>=1.0.0"]
+requires = ["poetry-core>=1.0.0", "pyScss"]
 build-backend = "poetry.core.masonry.api"
 
 [tool.poetry.scripts]