diff --git a/py35-upper-constraints.txt b/py35-upper-constraints.txt
new file mode 100644
index 00000000..ddb5b0fa
--- /dev/null
+++ b/py35-upper-constraints.txt
@@ -0,0 +1,7 @@
+oslo.i18n===3.25.1
+debtcollector===1.22.0
+oslotest===3.9.0
+reno===2.11.3
+mox3===0.28.0
+oslo.config===7.0.0
+oslo.utils===3.42.1
diff --git a/tox.ini b/tox.ini
index 97ff0cec..dc703134 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,6 +18,12 @@ whitelist_externals =
   bash
 basepython = python3
 
+[testenv:py35]
+deps =
+  -c{toxinidir}/py35-upper-constraints.txt
+  -r{toxinidir}/requirements.txt
+  -r{toxinidir}/test-requirements.txt
+
 [testenv:pep8]
 commands =
   flake8