diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index 6d6f69d2c..c625b883e 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -58,7 +58,7 @@ jobs:
         include:
           - # test with the latest dependencies
             os: ubuntu-latest
-            python-version: '3.11'
+            python-version: '3.12'
             toxenv-factors: '-current'
           - # test with the lowest dependencies
             os: ubuntu-latest
@@ -93,7 +93,8 @@ jobs:
       matrix:
         os: ['ubuntu-latest', 'windows-latest', 'macos-latest']
         python-version:
-          - "3.11" # highest supported
+          - "3.12.0-rc.3" # highest supported
+          - "3.11"
           - "3.10"
           - "3.9"
           - "3.8"  # lowest supported
@@ -189,7 +190,7 @@ jobs:
         # see https://github.com/actions/setup-python
         uses: actions/setup-python@v4
         with:
-          python-version: '>=3.8 <=3.11'  # supported version range
+          python-version: '>=3.8 <=3.12'  # supported version range
       - name: Validate Python Environment
         shell: python
         run: |
diff --git a/pyproject.toml b/pyproject.toml
index d0bc7f55b..6a59e6159 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,6 +47,7 @@ classifiers = [
   'Programming Language :: Python :: 3.9',
   'Programming Language :: Python :: 3.10',
   'Programming Language :: Python :: 3.11',
+  'Programming Language :: Python :: 3.12',
   'Typing :: Typed',
 ]
 keywords = [