Index: pyproject.toml
--- pyproject.toml.orig
+++ pyproject.toml
@@ -36,5 +36,5 @@ trio = ['trio']
 curio = ['curio', 'sniffio']
 
 [build-system]
-requires = ["poetry>=0.12"]
-build-backend = "poetry.masonry.api"
+requires = ["poetry-core>=0.12"]
+build-backend = "poetry.core.masonry.api"