diff --git a/test-requirements.txt b/test-requirements.txt
index b3d4dee..4faeb8d 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -7,7 +7,7 @@ fixtures>=3.0.0 # Apache-2.0/BSD
 hacking<0.13,>=0.12.0 # Apache-2.0
 mock>=2.0 # BSD
 requests-mock>=1.1 # Apache-2.0
-sphinx>=1.5.1 # BSD
+sphinx!=1.6.1,>=1.5.1 # BSD
 oslosphinx>=4.7.0 # Apache-2.0
 reno>=1.8.0 # Apache-2.0
 oslo.concurrency>=3.8.0 # Apache-2.0