diff --git a/pyproject.toml b/pyproject.toml
index 9afa16d2..64152fe4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -94,6 +94,6 @@ dev = ["yapf", "pytest", "pre-commit", "pytest-cov", "pylint", "sphinx-rtd-theme
 
 
 [build-system]
-requires = ["poetry>=1.2.0"]
+requires = ["poetry>=1.2.0a2"]
 build-backend = "poetry.masonry.api"