diff --git a/setup.cfg b/setup.cfg
index 9d2905d..619dc56 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -30,6 +30,7 @@ packages = find:
 python_requires = >=3.8
 install_requires =
 	pytest>=4.6
+	packaging
 
 [options.entry_points]
 pytest11 =