diff --git a/pyproject.toml b/pyproject.toml
index 3aa6c3b..a69f1f6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,7 @@ numpy = "^1.21"  # For NumPy Typing.
 optional = true
 
 [tool.poetry.group.test.dependencies]
-pytest = "^7"
+pytest = ">=7,<9"
 
 [build-system]
 requires = ["poetry_core"]