diff --git a/tox.ini b/tox.ini
index d5bb105..828524a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py{36,37,38}-pillow{70,71,-latest},pypy3,check
+envlist = py{36,37,38,39}-pillow{70,71,-latest},pypy3,check
 skip_missing_interpreters = True
 
 [gh-actions]
@@ -7,6 +7,7 @@ python =
     3.6: py36-pillow70
     3.7: py37-pillow71
     3.8: py38-pillow-latest, check
+    3.9: py39-pillow-latest
     pypy3: pypy3
 
 [testenv]