diff --git a/test-requirements.txt b/test-requirements.txt
index f557f0ba7c0e..ef14c2d50448 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -13,7 +13,7 @@ PyMySQL>=0.7.6 # MIT License
 python-barbicanclient!=4.5.0,!=4.5.1,>=4.0.0 # Apache-2.0
 python-ironicclient>=2.2.0 # Apache-2.0
 requests-mock>=1.1.0 # Apache-2.0
-sphinx!=1.6.6,<1.7.0,>=1.6.2 # BSD
+sphinx!=1.6.6,>=1.6.2 # BSD
 sphinxcontrib-actdiag>=0.8.5 # BSD
 sphinxcontrib-seqdiag>=0.8.4 # BSD
 os-api-ref>=1.4.0 # Apache-2.0