diff --git a/doc/requirements.txt b/doc/requirements.txt
index f1688868f..524ff3472 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,7 +1,7 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
-sphinx!=1.6.6,>=1.6.2 # BSD
+sphinx!=1.6.6,<1.7.0,>=1.6.2 # BSD
 docutils>=0.11 # OSI-Approved Open Source, Public Domain
 openstackdocstheme>=1.18.1 # Apache-2.0
 beautifulsoup4>=4.6.0 # MIT