Workaround suggested at python-poetry/poetry#3153 (comment)

Author: jwg4

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "exact_cover"
-version = "0.3.2"
+version = "0.4.0-alpha.0"
 description = "Solve exact cover problems"
 readme = "README.md"
 authors = ["Moy Easwaran"]
@@ -26,5 +26,5 @@ script = "build.py"
 test = 'build:test'
 
 [build-system]
-requires = ["poetry-core>=1.0.0"]
+requires = ["setuptools", "poetry-core>=1.0.0"]
 build-backend = "poetry.core.masonry.api"