@@ -3,7 +3,7 @@ exclude = .eggs,.git,.tox,build,dist,docs,venv*
 select = E4,E9,W1,W2,W3,W6
 
 [tox:tox]
-envlist = py36,py37,py38,pypy3
+envlist = py36,py37,py38,py39,pypy3
 
 [tox:testenv]
 deps = pytest
 
@@ -21,7 +21,7 @@ then
     exit 1
 fi
 
-PYTHONS="cp36-cp36m cp37-cp37m cp38-cp38"
+PYTHONS="cp36-cp36m cp37-cp37m cp38-cp38 cp39-cp39"
 
 
 # Avoid creation of __pycache__/*.py[c|o]