diff --git a/requirements-indirect.txt b/requirements-indirect.txt
index 9f9c0aec0..60c92e728 100644
--- a/requirements-indirect.txt
+++ b/requirements-indirect.txt
@@ -23,6 +23,6 @@ pyrsistent==0.16.0
 smmap==3.0.4
 smmap2==3.0.1
 toml==0.10.1
-tox==2.9.1
+tox==3.18.1
 virtualenv==20.0.29
 wcwidth==0.1.9