diff --git a/.travis.yml b/.travis.yml
index 86bec65..f904565 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,6 +24,8 @@ matrix:
     - python: 3.7
     - python: 3.6
     - python: 3.5
+    - python: 3.9-dev
+    - python: 3.10-dev
     - python: pypy3
 
 install:
diff --git a/tox.ini b/tox.ini
index ecb5bd7..87367e0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py38, py37, py36, py35, pypy3
+envlist = py{36, 37, 38, 39, 310, py3}
 
 [testenv]
 extras = tests