diff --git a/tox.ini b/tox.ini
index 391d0f4c..64159a8f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 1.6
-envlist = py35,py27,pypy,pep8
+envlist = py36,py35,py27,pypy,pep8
 skipsdist = True
 
 [testenv]
@@ -89,4 +89,4 @@ basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands =
   rm -rf releasenotes/build
-  sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
\ No newline at end of file
+  sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html