diff --git a/requirements.txt b/requirements.txt
index 500a68a5..e6c0afd1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ pbr>=1.6 # Apache-2.0
 iso8601>=0.1.11 # MIT
 lxml>=2.3 # BSD
 oslo.config>=3.14.0 # Apache-2.0
-sphinx!=1.3b1,<1.3,>=1.2.1 # BSD
+sphinx!=1.3b1,<1.4,>=1.2.1 # BSD
 demjson # GLGPLv3+
 PyYAML>=3.1.0 # MIT
 cliff-tablib>=1.0 # Apache-2.0