diff --git a/pyproject.toml b/pyproject.toml
index e1438e1..322d4a9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["poetry-core>=1.8.1"]
+requires = ["poetry-core==1.8.1"]
 build-backend = "poetry.core.masonry.api"
 
 [tool]