diff --git a/pyproject.toml b/pyproject.toml
index c6cf861..2cb418f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,9 @@ classifiers = [
 "Intended Audience :: Researcher"
 ]
 repository = "https://github.com/cimatosa/stocproc"
-build = 'build.py'
+
+[tool.poetry.build]
+script = "build.py"
 generate-setup-file = true
 
 [tool.poetry.dependencies]