diff --git a/doc/requirements.txt b/doc/requirements.txt
index c3575eb7ae..42bd45475d 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -2,7 +2,6 @@
 # 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!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7' # BSD
 sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2;python_version>='3.4'  # BSD
 sphinxcontrib-apidoc>=0.2.0  # BSD
 sphinxcontrib-seqdiag>=0.8.4  # BSD