diff --git a/test-requirements.txt b/test-requirements.txt
index f4b6f8e..c7549fd 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -5,7 +5,8 @@
 hacking>=1.1.0,<1.2.0 # Apache-2.0
 
 # docs
-sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4' # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7' # BSD
 openstackdocstheme>=1.18.1 # Apache-2.0
 # releasenotes
 reno>=2.5.0 # Apache-2.0