diff --git a/tox.ini b/tox.ini
index de4f8f1b..a482e70f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,8 +1,9 @@
 # Reference: https://github.com/ethereum/ethereum-python-project-template/blob/master/tox.ini
 
-# TODO: consider py36 and pypy3 support
+# TODO: consider pypy3 support
 [tox]
 envlist =
+    py36-test
     py37-test
     py37-interop
     lint
@@ -37,6 +38,7 @@ commands =
 basepython =
     docs: python
     py37: python3.7
+    py36: python3.6
 extras =
     test
     docs: doc