diff --git a/test-requirements.txt b/test-requirements.txt
index a51ca57..c574c45 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,7 +3,8 @@
 # process, which may cause wedges in the gate later.
 
 doc8>=0.6.0 # Apache-2.0
-sphinx>=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
 openstackdocstheme>=1.17.0 # Apache-2.0
 # releasenotes
 reno>=2.5.0 # Apache-2.0