diff --git a/requirements-dev.txt b/requirements-dev.txt
index 2eefc16..e15ddce 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,7 +1,7 @@
 pytest
 pytest-cov
 pytest-mypy
-pytest-ruff
+pytest-ruff ; python_version >= "3.7"
 black
 ruff
 pre-commit