diff --git a/doc/requirements.txt b/doc/requirements.txt
new file mode 100644
index 0000000..60ba470
--- /dev/null
+++ b/doc/requirements.txt
@@ -0,0 +1,4 @@
+sphinx>=2.0.0,!=2.1.0 # BSD
+openstackdocstheme>=2.2.1 # Apache-2.0
+# releasenotes
+reno>=3.1.0 # Apache-2.0
diff --git a/test-requirements.txt b/test-requirements.txt
index ae03f19..bc343e1 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,8 +3,3 @@
 # process, which may cause wedges in the gate later.
 
 hacking>=3.0.1,<3.1.0;python_version>='3.5' # Apache-2.0
-
-sphinx>=2.0.0,!=2.1.0 # BSD
-openstackdocstheme>=2.2.1 # Apache-2.0
-# releasenotes
-reno>=3.1.0 # Apache-2.0
diff --git a/tox.ini b/tox.ini
index f930ee4..f374acd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -35,9 +35,12 @@ commands =
     coverage xml -o cover/coverage.xml
 
 [testenv:docs]
+deps = -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+       -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:releasenotes]
+deps = {[testenv:docs]deps}
 commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html