diff --git a/test-requirements.txt b/test-requirements.txt
index 5f78da3d8..c1408dea5 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,6 +1,6 @@
 # needed for doc build
 docutils>=0.11,!=0.13.1  # OSI-Approved Open Source, Public Domain
-sphinx>=1.5.0
+sphinx>=1.5.0,<1.6.1
 PyYAML>=3.1.0
 yamllint>=0.5.2
 requests-cache