diff --git a/.travis.yml b/.travis.yml
index 22a8c08..9dfac1f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,7 @@ python:
   - "3.6"
   - "3.7"
   - "3.8"
+  - "3.9"
   - "pypy"
 before_install:
   - scripts/install-on-travis.sh
diff --git a/tox.ini b/tox.ini
index 42f4e82..bd9c54a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@
 # directory.
 
 [tox]
-envlist = py27, py35, py36, py37, py38, pypy
+envlist = py27, py35, py36, py37, py38, py39, pypy
 
 [testenv]
 deps = -rrequirements-tests.txt