diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 75833d4..65eb72e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "pypy-3.8"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12-dev", "pypy-3.8"]
 
     steps:
       - uses: actions/checkout@v3.5.2
diff --git a/tox.ini b/tox.ini
index 51ad0a4..b209bd9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,8 +3,8 @@ skip_missing_interpreters=true
 envlist =
   cov-clean,
   lint,
-  {py38,py39,py310,py311}-{requests-urllib3-1,httplib2,urllib3-1,tornado4,boto3,aiohttp,httpx},
-  {py310,py311}-{requests-urllib3-2,urllib3-2},
+  {py38,py39,py310,py311,py312}-{requests-urllib3-1,httplib2,urllib3-1,tornado4,boto3,aiohttp,httpx},
+  {py310,py311,py312}-{requests-urllib3-2,urllib3-2},
   {pypy3}-{requests-urllib3-1,httplib2,urllib3-1,tornado4,boto3},
   {py310}-httpx019,
   cov-report
@@ -16,6 +16,7 @@ python =
     3.9: py39
     3.10: py310, lint
     3.11: py311
+    3.12: py312
     pypy-3: pypy3
 
 # Coverage environment tasks: cov-clean and cov-report
@@ -74,8 +75,8 @@ deps =
     httpx019: httpx==0.19
     {py38,py39,py310}-{httpx}: pytest-asyncio
 depends =
-  lint,{py38,py39,py310,py311,pypy3}-{requests-urllib3-1,httplib2,urllib3-1,tornado4,boto3},{py310,py311}-{requests-urllib3-2,urllib3-2},{py38,py39,py310,py311}-{aiohttp},{py38,py39,py310,py311}-{httpx}: cov-clean
-  cov-report: lint,{py38,py39,py310,py311,pypy3}-{requests-urllib3-1,httplib2,urllib3-1,tornado4,boto3},{py310,py311}-{requests-urllib3-2,urllib3-2},{py38,py39,py310,py311}-{aiohttp}
+  lint,{py38,py39,py310,py311,py312,pypy3}-{requests-urllib3-1,httplib2,urllib3-1,tornado4,boto3},{py310,py311,py312}-{requests-urllib3-2,urllib3-2},{py38,py39,py310,py311,py312}-{aiohttp},{py38,py39,py310,py311,py312}-{httpx}: cov-clean
+  cov-report: lint,{py38,py39,py310,py311,py312,pypy3}-{requests-urllib3-1,httplib2,urllib3-1,tornado4,boto3},{py310,py311,py312}-{requests-urllib3-2,urllib3-2},{py38,py39,py310,py311,py312}-{aiohttp}
 passenv =
     AWS_ACCESS_KEY_ID
     AWS_DEFAULT_REGION