diff --git a/pyproject.toml b/pyproject.toml
index 4385532..9d5653a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -70,7 +70,7 @@ numba = ["numba"]
 pytz = ["pytz"]
 
 [build-system]
-requires = ["poetry-core>=1.0.0", "cffi", "setuptools>=65.5"]
+requires = ["poetry-core>=1.0.0,<2.0.0", "cffi", "setuptools>=65.5"]
 build-backend = "poetry.core.masonry.api"
 
 [tool.poetry.build]