diff --git a/test-requirements.txt b/test-requirements.txt
index c2e49e7..e4a7da3 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -8,7 +8,8 @@ stestr>=2.0.0 # Apache-2.0
 
 # These are needed for docs generation
 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
 
 # for testing optional parts
 oslo.config>=5.2.0 # Apache-2.0