diff --git a/test-requirements.txt b/test-requirements.txt
index 9b244c7..9a9a35c 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -11,7 +11,7 @@ fixtures>=3.0.0 # Apache-2.0/BSD
 mock>=2.0 # BSD
 oslosphinx>=4.7.0 # Apache-2.0
 oslotest>=1.10.0 # Apache-2.0
-sphinx>=1.5.1 # BSD
+sphinx!=1.6.1,>=1.5.1 # BSD
 tempest>=14.0.0 # Apache-2.0
 testrepository>=0.0.18 # Apache-2.0/BSD
 testtools>=1.4.0 # MIT