diff --git a/pyproject.toml b/pyproject.toml
index 8ff3570f..1f663c5f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,4 +15,4 @@
 [tool.black]
 line-length = 80
 # NB: Keep in sync with tox.ini.
-target-version = ['py36', 'py37', 'py38', 'py39', 'py310']
+target-version = ['py36', 'py37', 'py38', 'py39', 'py310', 'py311']
diff --git a/tox.ini b/tox.ini
index ccf2ffff..0a989c21 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,7 +15,7 @@
 # https://tox.readthedocs.io/
 
 [tox]
-envlist = lint, py36, py37, py38, py39, py310
+envlist = lint, py36, py37, py38, py39, py310, py311
 
 [gh-actions]
 python =
@@ -24,6 +24,7 @@ python =
     3.8: py38
     3.9: py39
     3.10: py310
+    3.11: py311
 
 [testenv]
 deps =