diff --git a/misc/requirements/requirements-tox.txt b/misc/requirements/requirements-tox.txt
index dded02a5b..28a3072e1 100644
--- a/misc/requirements/requirements-tox.txt
+++ b/misc/requirements/requirements-tox.txt
@@ -4,5 +4,5 @@ pluggy==0.7.1
 py==1.6.0
 six==1.11.0
 toml==0.10.0
-tox==3.4.0
+tox==3.5.1
 virtualenv==16.0.0