diff --git a/.github/workflows/ci_workflows.yml b/.github/workflows/ci_workflows.yml
index c03a8b9..db355e4 100644
--- a/.github/workflows/ci_workflows.yml
+++ b/.github/workflows/ci_workflows.yml
@@ -43,8 +43,8 @@ jobs:
             python-version: '3.11'
             toxenv: py311-test-sphinx71-cov-clocale
           - os: ubuntu-latest
-            python-version: '3.11'
-            toxenv: py311-test-sphinxdev
+            python-version: '3.12-dev'
+            toxenv: py312-test-sphinxdev
 
           # MacOS X - just the stable and dev
           - os: macos-latest
diff --git a/tox.ini b/tox.ini
index f20571a..4ec899f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py{37,38,39,310,311}-test-sphinx{40,53,62,70,71,dev}{-cov}{-clocale}
+envlist = py{37,38,39,310,311,312}-test-sphinx{40,53,62,70,71,dev}{-cov}{-clocale}
 requires = pip >= 18.0
            setuptools >= 30.3.0
 isolated_build = true