diff --git a/test-requirements.txt b/test-requirements.txt
index 34354e6dc..caff3e7bf 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -10,4 +10,4 @@ pytest-cov
 pytest-xdist
 randomize>=0.13
 recommonmark
-sphinx>=1.2.1,!=1.3b1,<3.5 # BSD
+sphinx>=1.2.1,!=1.3b1,<6.1 # BSD