diff --git a/test-requirements.txt b/test-requirements.txt
index 1840c5f..34251ea 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -9,7 +9,7 @@ fixtures>=3.0.0 # Apache-2.0/BSD
 
 # These are needed for docs generation
 openstackdocstheme>=1.18.1 # Apache-2.0
-sphinx!=1.6.6,>=1.6.2 # BSD
+sphinx!=1.6.6,<1.7.0,>=1.6.2 # BSD
 reno>=2.5.0 # Apache-2.0
 
 # Bandit security code scanner