diff --git a/lower-constraints.txt b/lower-constraints.txt
index 99965df90..3de103693 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -2,6 +2,7 @@ appdirs==1.3.0
 coverage==4.0
 cryptography==2.1
 decorator==3.4.0
+doc8==0.8.0
 dogpile.cache==0.6.2
 extras==1.0.0
 fixtures==3.0.0
@@ -23,6 +24,7 @@ os-client-config==1.28.0
 os-service-types==1.2.0
 oslotest==3.2.0
 pbr==2.0.0
+Pygments==2.2.0
 python-mimeparse==1.6.0
 python-subunit==1.0.0
 PyYAML==3.12
diff --git a/test-requirements.txt b/test-requirements.txt
index 54ba19d09..bbc69b07f 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,6 +1,8 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
+hacking>=1.0,<1.2 # Apache-2.0
+
 coverage!=4.4,>=4.0 # Apache-2.0
 extras>=1.0.0 # MIT
 fixtures>=3.0.0 # Apache-2.0/BSD
@@ -13,3 +15,5 @@ stestr>=1.0.0 # Apache-2.0
 testrepository>=0.0.18 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT
+doc8>=0.8.0  # Apache-2.0
+Pygments>=2.2.0  # BSD license
diff --git a/tox.ini b/tox.ini
index 20e755222..726004b65 100644
--- a/tox.ini
+++ b/tox.ini
@@ -39,15 +39,9 @@ commands = stestr --test-path ./openstack/tests/functional/{env:OPENSTACKSDK_TES
            stestr slowest
 
 [testenv:pep8]
-deps =
-    {[testenv]deps}
-    hacking
-    doc8
-    pygments
-    readme
 commands =
     flake8
-    doc8 doc/source
+    doc8 doc/source README.rst
 
 [hacking]
 local-check-factory = openstack._hacking.factory