diff --git a/.github/workflows/ci-linux.yaml b/.github/workflows/ci-linux.yaml
index 0df7e104..c9d0402a 100644
--- a/.github/workflows/ci-linux.yaml
+++ b/.github/workflows/ci-linux.yaml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
         os: [ubuntu-latest]
 
     steps:
diff --git a/.github/workflows/ci-osx.yaml b/.github/workflows/ci-osx.yaml
index 51ae7fdf..684736ac 100644
--- a/.github/workflows/ci-osx.yaml
+++ b/.github/workflows/ci-osx.yaml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
 
     steps:
       - name: Checkout source
diff --git a/.github/workflows/ci-windows.yaml b/.github/workflows/ci-windows.yaml
index a03ab487..aa675079 100644
--- a/.github/workflows/ci-windows.yaml
+++ b/.github/workflows/ci-windows.yaml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
 
     steps:
       - name: Checkout source
diff --git a/setup.py b/setup.py
index 02551c5d..18e9aaa0 100644
--- a/setup.py
+++ b/setup.py
@@ -363,6 +363,7 @@ def run_setup(with_extensions):
             "Programming Language :: Python :: 3.8",
             "Programming Language :: Python :: 3.9",
             "Programming Language :: Python :: 3.10",
+            "Programming Language :: Python :: 3.11",
         ],
         author='Alistair Miles',
         author_email='alimanfoo@googlemail.com',
diff --git a/tox.ini b/tox.ini
index e2a48b6b..c96b80a8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,17 +3,17 @@
 # To use it, "pip install tox" and then run "tox" from this directory.
 
 [tox]
-envlist = py37, py38, py39, py310, docs
+envlist = py37, py38, py39, py310, py311, docs
 
 [testenv]
 setenv =
     PYTHONHASHSEED = 42
     # hooks for coverage exclusions based on Python major version
-    py37,py38,py39,py310: PY_MAJOR_VERSION = py3
+    py37,py38,py39,py310,py311: PY_MAJOR_VERSION = py3
 commands =
     python setup.py build_ext --inplace
-    py37,py38,py39: pytest -v --cov=numcodecs numcodecs
-    py310: pytest -v --cov=numcodecs --doctest-modules --doctest-glob=*.pyx numcodecs
+    py37,py38,py39,310: pytest -v --cov=numcodecs numcodecs
+    py311: pytest -v --cov=numcodecs --doctest-modules --doctest-glob=*.pyx numcodecs
     coverage report -m
     py310: flake8 numcodecs
     pip freeze
@@ -22,7 +22,7 @@ deps =
     -rrequirements_test.txt
 
 [testenv:docs]
-basepython = python3.10
+basepython = python3.11
 changedir = docs
 deps =
     -rrequirements_rtfd.txt