diff --git a/test-requirements.txt b/test-requirements.txt
index 4d7f782..d5400b5 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -4,7 +4,7 @@
 
 hacking<0.13,>=0.12.0 # Apache-2.0
 
-sphinx!=1.6.6,>=1.6.2 # BSD
+sphinx!=1.6.6,<1.7.0,>=1.6.2 # BSD
 openstackdocstheme>=1.18.1 # Apache-2.0
 # releasenotes
 reno>=2.5.0 # Apache-2.0