diff --git a/pyproject.toml b/pyproject.toml
index 3e55a464..584ea075 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,10 @@ furo = "^2021.9.22"
 codecov = "^2.1.12"
 click = "8.0.4"
 flake8 = "4.0.1"
-scipy = "^1.10.1"
+scipy = [
+    { version = ""^1.10.1"", markers = "python_version < '3.9'" },
+    { version = ""^1.12.0"", markers = "python_version >= '3.9'" },
+]
 mypy = "^1.11.1"
 pyproject-flake8 = "4.0.1"