diff --git a/doc/requirements.txt b/doc/requirements.txt
index d86fbab71..390866099 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 openstackdocstheme>=1.20.0 # Apache-2.0
-sphinx>=1.8.0,!=2.1.0;python_version>='3.4' # BSD
+sphinx>=1.8.0,!=2.1.0,!=3.0.0 # BSD
 sphinxcontrib-pecanwsme>=0.8.0 # Apache-2.0
 sphinxcontrib-svg2pdfconverter>=0.1.0 # BSD
 reno>=2.7.0 # Apache-2.0