diff --git a/test-requirements.txt b/test-requirements.txt
index 136ccf8af..c1fe0f662 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -11,7 +11,7 @@ oslotest>=1.10.0 # Apache-2.0
 reno>=1.8.0 # Apache-2.0
 requests!=2.12.2,!=2.13.0,>=2.10.0 # Apache-2.0
 requests-mock>=1.1 # Apache-2.0
-sphinx>=1.5.1 # BSD
+sphinx!=1.6.1,>=1.5.1 # BSD
 stevedore>=1.20.0 # Apache-2.0
 os-client-config>=1.27.0 # Apache-2.0
 os-testr>=0.8.0 # Apache-2.0