diff --git a/misc/requirements/requirements-tox.txt b/misc/requirements/requirements-tox.txt
index 018f3823d..47ea7a4e3 100644
--- a/misc/requirements/requirements-tox.txt
+++ b/misc/requirements/requirements-tox.txt
@@ -6,4 +6,4 @@ py==1.7.0
 six==1.12.0
 toml==0.10.0
 tox==3.7.0
-virtualenv==16.1.0
+virtualenv==16.4.0