diff --git a/test-requirements.txt b/test-requirements.txt
index 9e5898bff..c44f6b4b9 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -7,9 +7,7 @@ openstack-doc-tools>=1.1.0 # Apache-2.0
 doc8 # Apache-2.0
 Pygments
 
-# At least 1.3 is required for dedent in code blocks. Capped to 1.3 to
-# not get an automatic update to any newer versions.
-sphinx>=1.3,!=1.3b1,<1.4 # BSD
+sphinx>=1.5.1,<1.6 # BSD
 
 openstackdocstheme>=1.5.0 # Apache-2.0
 nwdiag