diff --git a/test-requirements.txt b/test-requirements.txt
index e6ab32bd..e3dd2a39 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -14,5 +14,5 @@ testtools>=2.2.0 # MIT
 
 # Doc requirements
 doc8>=0.6.0 # 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