diff --git a/setup.cfg b/setup.cfg
index 402d826..f6ad18a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -106,3 +106,5 @@ dev =
     sphinx-autobuild
     tox <4; python_version <"3.8.0"  # https://github.com/redeboer/PawianTools/actions/runs/3861498991/jobs/6582508970#step:3:91
     tox >=1.9  # for skip_install, use_develop
+    virtualenv <20.22.0; python_version <"3.8.0"  # importlib-metadata conflict
+    virtualenv!=20.16.*,!=20.17.*  # https://github.com/redeboer/PawianTools/actions/runs/4359491077/jobs/7621340858#step:3:76