diff --git a/test-requirements.txt b/test-requirements.txt
index 41bb550..46ac3e6 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -16,6 +16,6 @@ testtools>=1.4.0 # MIT
 six>=1.9.0 # MIT
 
 # this is required for the docs build jobs
-sphinx!=1.3b1,<1.4,>=1.2.1 # BSD
+sphinx>=1.5.1 # BSD
 oslosphinx>=4.7.0 # Apache-2.0