diff --git a/doc/requirements.txt b/doc/requirements.txt
new file mode 100644
index 0000000..1489bce
--- /dev/null
+++ b/doc/requirements.txt
@@ -0,0 +1,3 @@
+sphinx>=2.0.0,!=2.1.0 # BSD
+openstackdocstheme>=2.2.1 # Apache-2.0
+reno>=3.1.0 # Apache-2.0
diff --git a/test-requirements.txt b/test-requirements.txt
index 5f1d4fd..a043fc9 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -7,9 +7,3 @@ hacking>=1.1.0,<3.0.1 # Apache-2.0
 # hacking to 3.2.0 or above. hacking 3.2.0 takes
 # care of pyflakes version compatibilty.
 pyflakes>=2.1.1 # MIT
-
-# docs
-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 8a9c3de..4db3590 100644
--- a/tox.ini
+++ b/tox.ini
@@ -35,16 +35,20 @@ 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:pdf-docs]
+deps = {[testenv:docs]deps}
 whitelist_externals = make
 commands =
     sphinx-build -b latex doc/source doc/build/pdf
     make -C doc/build/pdf
 
 [testenv:releasenotes]
+deps = {[testenv:docs]deps}
 commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html