diff --git a/scripts/dev/ci/requirements-tox.txt b/scripts/dev/ci/requirements-tox.txt
index 57a912109..2b7047276 100644
--- a/scripts/dev/ci/requirements-tox.txt
+++ b/scripts/dev/ci/requirements-tox.txt
@@ -1,4 +1,4 @@
 pluggy==0.3.1
 py==1.4.31
 tox==2.3.1
-virtualenv==15.0.1
+virtualenv==15.0.1  # rq.filter: <= 15.0.1