diff --git a/pyproject.toml b/pyproject.toml
index 426fe2f..804bbfa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,7 @@ exclude = ["examples", "benchmark"]
 
 [tool.poetry.dependencies]
 numpy = "^1.22.0"
-python = "^3.10"
+python = "^3.9"
 PyYAML = "^6.0.1"
 rich = "^13.6.0"
 scikit-image = "^0.22.0"