diff --git a/tox.ini b/tox.ini
index 46f0fb3e0..d2116e934 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 [tox]
 envlist =
     docs, packaging, lint-py2, lint-py3, mypy,
-    py27, py34, py35, py67, py37, pypy, pypy3
+    py27, py34, py35, py36, py37, pypy, pypy3
 
 [testenv]
 passenv = CI GIT_SSL_CAINFO