diff --git a/requirements.txt b/requirements.txt
index 8abd148..784e153 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
 pbr>=1.1.0
-sphinx>=1.5.1,<1.6.0 # BSD
+sphinx>=1.5.1
 pyyaml