diff --git a/requirements/test.txt b/requirements/test.txt
index 748a9767..c1ae034b 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -165,7 +165,7 @@ toml==0.10.2
     #   coverage
     #   pytest
     #   tox
-tox==3.23.1
+tox==4.0.19
     # via -r requirements/test.in
 traceback2==1.4.0
     # via