diff --git a/tox.ini b/tox.ini
index df1b0ef..47eae51 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,6 +5,8 @@ minversion = 2.4
 [testenv]
 deps =
 	setuptools>=31.0.1
+	# workaround for yaml/pyyaml#126
+	# git+https://github.com/yaml/pyyaml@master#egg=pyyaml
 commands =
 	py.test {posargs}
 	python setup.py checkdocs