diff --git a/tox.ini b/tox.ini
index f66d620e..ee486901 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,12 +5,12 @@ skipsdist = True
 ignore_basepython_conflict = True
 
 [testenv]
-basepython = python3
 usedevelop = True
 setenv =
   PYTHONDONTWRITEBYTECODE=1
 deps =
   -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt
 commands =
   stestr run {posargs}