diff --git a/test-requirements.txt b/test-requirements.txt
index 0405624..7b05fad 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -7,7 +7,7 @@ coverage!=4.4,>=4.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
 mock>=2.0.0 # BSD
 python-subunit>=1.0.0 # Apache-2.0/BSD
-sphinx!=1.6.6,>=1.6.2 # BSD
+sphinx!=1.6.6,<1.7.0,>=1.6.2 # BSD
 testrepository>=0.0.18 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT