diff --git a/multiple_python_version/Makefile b/multiple_python_version/Makefile
index 0520db1..e5b2a30 100644
--- a/multiple_python_version/Makefile
+++ b/multiple_python_version/Makefile
@@ -33,7 +33,8 @@ install_dependencies:
 	$(py_install) install -U pip wheel
 	$(py_install) install pytest python-dotenv pytest-icdiff
 
-install: venv install_dependencies
+install: venv
+	$(pytest) --version || install_dependencies
 
 venv:
 	make .venv3.$(minor)