diff --git a/tox.ini b/tox.ini
index f6ef3aa36..c67abc8bf 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,6 +3,9 @@ minversion = 1.6
 skipsdist = True
 envlist = linters
 ignore_basepython_conflict = True
+# Necessary for python 2.7 support
+requires =
+  virtualenv<20.22.0
 
 [testenv]
 basepython = python3