diff --git a/pyproject.toml b/pyproject.toml
index 0d1d52ad..fdaa21ca 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -44,7 +44,7 @@ pyoxigraph = "^0.3.19"
 coverage = "^7.3.2"
 
 [build-system]
-requires = ["poetry-core>=1.0.0"]
+requires = ["poetry-core>=1.9.0"]
 build-backend = "poetry.core.masonry.api"
 
 [tool.black]