diff --git a/doc/requirements.txt b/doc/requirements.txt
index 60e8eb88..68cdb688 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -2,6 +2,6 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 # These are needed for docs generation
-sphinx!=1.6.6,<1.7.0,>=1.6.2 # BSD
+sphinx!=1.6.6,>=1.6.2 # BSD
 openstackdocstheme>=1.18.1 # Apache-2.0
 reno>=2.5.0 # Apache-2.0