diff --git a/doc/requirements.txt b/doc/requirements.txt
index 7523a0dae..350e9751f 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,8 +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,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7' # BSD
-sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4' # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
 sphinxcontrib-seqdiag>=0.8.4 # BSD
 openstackdocstheme>=1.30.0 # Apache-2.0
 yasfb>=0.8.0 # BSD