diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index bbbd1add..727940a4 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8,3.9,"3.10","3.11"]
+        python-version: [3.8,3.9,"3.10","3.11","3.12"]
     steps:
       - name: Install system packages
         run: sudo apt-get update && sudo apt-get install libcurl4-openssl-dev libssl-dev
@@ -29,7 +29,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.8,3.9,"3.10","3.11"]
+        python-version: [3.8,3.9,"3.10","3.11","3.12"]
         experimental: [false]
         include:
           - python-version: pypy3.9
diff --git a/t/unit/asynchronous/test_hub.py b/t/unit/asynchronous/test_hub.py
index 27b048b9..e46d338d 100644
--- a/t/unit/asynchronous/test_hub.py
+++ b/t/unit/asynchronous/test_hub.py
@@ -193,7 +193,7 @@ class test_Hub:
         callback = Mock(name='callback')
         with patch.object(self.hub, '_ready_lock', autospec=True) as lock:
             self.hub.call_soon(callback)
-            assert lock.__enter__.called_once()
+            lock.__enter__.assert_called_once()
 
     def test_call_soon__promise_argument(self):
         callback = promise(Mock(name='callback'), (1, 2, 3))
diff --git a/tox.ini b/tox.ini
index af50895b..6e288301 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 [tox]
 envlist =
-    {pypy3.9,3.8,3.9,3.10,3.11}-unit
-    {pypy3.9,3.8,3.9,3.10,3.11}-linux-integration-py-amqp
+    {pypy3.9,3.8,3.9,3.10,3.11,3.12}-unit
+    {pypy3.9,3.8,3.9,3.10,3.11,3.12}-linux-integration-py-amqp
     {pypy3.9,3.8,3.9,3.10,3.11}-linux-integration-redis
     {pypy3.9,3.8,3.9,3.10,3.11}-linux-integration-mongodb
     {3.8,3.9,3.10,3.11}-linux-integration-kafka
@@ -17,6 +17,7 @@ python =
     3.9: py39
     3.10: py310, mypy
     3.11: py311
+    3.12: py312
 
 [testenv]
 sitepackages = False
@@ -25,9 +26,9 @@ passenv =
   DISTUTILS_USE_SDK
 deps=
     -r{toxinidir}/requirements/dev.txt
-    apicheck,pypy3.9,3.8,3.9,3.10,3.11: -r{toxinidir}/requirements/default.txt
-    apicheck,pypy3.9,3.8,3.9,3.10,3.11: -r{toxinidir}/requirements/test.txt
-    apicheck,pypy3.9,3.8,3.9,3.10,3.11: -r{toxinidir}/requirements/test-ci.txt
+    apicheck,pypy3.9,3.8,3.9,3.10,3.11,3.12: -r{toxinidir}/requirements/default.txt
+    apicheck,pypy3.9,3.8,3.9,3.10,3.11,3.12: -r{toxinidir}/requirements/test.txt
+    apicheck,pypy3.9,3.8,3.9,3.10,3.11,3.12: -r{toxinidir}/requirements/test-ci.txt
     apicheck,3.8-linux,3.9-linux,3.10-linux,3.11-linux: -r{toxinidir}/requirements/extras/confluentkafka.txt
     apicheck,linkcheck: -r{toxinidir}/requirements/docs.txt
     flake8,pydocstyle,mypy: -r{toxinidir}/requirements/pkgutils.txt
@@ -46,6 +47,7 @@ basepython =
     3.9: python3.9
     3.10,apicheck,pydocstyle,flake8,linkcheck,cov,mypy: python3.10
     3.11: python3.11
+    3.12: python3.12
 
 install_command = python -m pip --disable-pip-version-check install {opts} {packages}
 
@@ -131,4 +133,4 @@ commands =
     pydocstyle {toxinidir}/kombu
 
 [testenv:mypy]
-commands = python -m mypy --config-file setup.cfg
+commands = python -m mypy --config-file setup.cfg
\ No newline at end of file