diff --git a/test-requirements.txt b/test-requirements.txt
index 061de95..bbf8861 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -5,4 +5,5 @@
 # Hacking already pins down pep8/pycodestyle pyflakes and flake8
 hacking>=1.1.0,<1.2.0 # Apache-2.0
 openstackdocstheme>=1.18.1 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7'  # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4'  # BSD