diff --git a/doc/requirements.txt b/doc/requirements.txt
new file mode 100644
index 0000000..eccc937
--- /dev/null
+++ b/doc/requirements.txt
@@ -0,0 +1,2 @@
+sphinx>=2.0.0,!=2.1.0 # BSD
+openstackdocstheme>=2.2.1 # Apache-2.0
diff --git a/test-requirements.txt b/test-requirements.txt
index 3d730fb..648121e 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -6,5 +6,3 @@ bashate>=0.5.1 # Apache-2.0
 hacking>=3.0.1,<3.1.0 # Apache-2.0
 
 docutils>=0.11 # OSI-Approved Open Source, Public Domain
-sphinx>=2.0.0,!=2.1.0 # BSD
-openstackdocstheme>=2.2.1 # Apache-2.0
diff --git a/tox.ini b/tox.ini
index 5a5217c..fe1cba0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,6 +18,8 @@ whitelist_externals = bash
 commands = {toxinidir}/tools/run_bashate.sh
 
 [testenv:docs]
+deps = -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+       -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -W -d doc/build/doctrees -b html doc/source/ doc/build/html
 
 [testenv:pep8]