diff --git a/test-requirements.txt b/test-requirements.txt
index 3e9abff..f47c1ad 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -7,7 +7,7 @@ hacking>=1.1.0,<1.2.0 # Apache-2.0
 coverage>=3.6
 python-subunit>=0.0.18
 sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7'  # BSD
-sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4'  # BSD
+sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2;python_version>='3.4'  # BSD
 nodeenv>=0.9.4 # BSD
 openstackdocstheme>=1.24.0 # Apache-2.0
 testrepository>=0.0.18