diff --git a/pyproject.toml b/pyproject.toml
index 8971b7c..454fc90 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires      = ["poetry-core>=1.1.0b2"]
+requires      = ["poetry-core>=1.1.0rc1"]
 build-backend = "poetry.core.masonry.api"