diff --git a/tox.ini b/tox.ini
index a46d87dbd6dd..916ea2f447cd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,8 @@ setenv = VIRTUAL_ENV={envdir}
          LANG=en_US.UTF-8
          LANGUAGE=en_US:en
          LC_ALL=C
-deps = -r{toxinidir}/requirements.txt
+deps = -U
+       -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands =
   python tools/patch_tox_venv.py