diff --git a/tox.ini b/tox.ini
index 92edcd7b4693..8df61ef43bbf 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,6 +5,11 @@ envlist = py39,functional,pep8
 # env and ignore basepython inherited from [testenv] if we set
 # ignore_basepython_conflict.
 ignore_basepython_conflict = True
+# Cap setuptools via virtualenv to prevent compatibility issue with yoga
+# branch's upper constraint of 'packaging' package (21.3).
+requires =
+  virtualenv<20.26.4
+  tox<4
 
 [testenv]
 basepython = python3