diff --git a/test-requirements.txt b/test-requirements.txt
index f4a54b5b5..421af3c32 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,4 @@
-sphinx>=1.6.2  # BSD
+sphinx>=1.6.2,<2.0.0  # BSD
 openstackdocstheme>=1.17.0  # Apache-2.0
 reno>=0.1.1 # Apache2
 stestr>=1.0.0 # Apache-2.0