diff --git a/.github/workflows/ci_cron_daily.yml b/.github/workflows/ci_cron_daily.yml
index 1d7da09c1..b1bb904b0 100644
--- a/.github/workflows/ci_cron_daily.yml
+++ b/.github/workflows/ci_cron_daily.yml
@@ -44,6 +44,14 @@ jobs:
             tox_env: 'py311-test-devdeps'
             toxposargs: --remote-data=any
             allow_failure: true
+            prefix: '(Allowed failure)'
+
+          - os: ubuntu-latest
+            python: '3.12-dev'
+            tox_env: 'py312-test-devdeps'
+            toxposargs: --remote-data=any
+            allow_failure: true
+            prefix: '(Allowed failure)'
 
     steps:
     - name: Check out repository
diff --git a/.github/workflows/ci_tests.yml b/.github/workflows/ci_tests.yml
index c4ae4af86..eb57cdbfa 100644
--- a/.github/workflows/ci_tests.yml
+++ b/.github/workflows/ci_tests.yml
@@ -98,6 +98,13 @@ jobs:
             allow_failure: true
             prefix: '(Allowed failure)'
 
+          - os: ubuntu-latest
+            python: '3.12-dev'
+            tox_env: 'py312-test-devdeps'
+            toxposargs: --remote-data=any
+            allow_failure: true
+            prefix: '(Allowed failure)'
+
     steps:
     - name: Check out repository
       uses: actions/checkout@v4
@@ -109,8 +116,7 @@ jobs:
         python-version: ${{ matrix.python }}
     - name: Install base dependencies
       run: |
-        python -m pip install --upgrade pip
-        python -m pip install tox
+        python -m pip install --upgrade pip setuptools tox
     - name: Print Python, pip, setuptools, and tox versions
       run: |
         python -c "import sys; print(f'Python {sys.version}')"
diff --git a/tox.ini b/tox.ini
index b97eabf3b..70caffd35 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 [tox]
 envlist =
-    py{39,310,311}-test{,-alldeps,-devdeps,-oldestdeps,-devinfra}{,-cov}
-    py{39,310,311}-test-numpy{122,123,124,125,126}
+    py{39,310,311,312}-test{,-alldeps,-devdeps,-oldestdeps,-devinfra}{,-cov}
+    py{39,310,311,312}-test-numpy{122,123,124,125,126}
     build_docs
     linkcheck
     codestyle
@@ -72,7 +72,9 @@ deps =
     devdeps: scikit-learn>=0.0.dev0
     devdeps: matplotlib>=0.0.dev0
     devdeps: astropy>=0.0.dev0
-    devdeps: git+https://github.com/spacetelescope/gwcs.git
+    # TEMPORARY: gwcs used deprecated pkg_resources
+    # https://github.com/spacetelescope/gwcs/pull/478
+    # devdeps: git+https://github.com/spacetelescope/gwcs.git
 
     # Latest developer version of infrastructure packages.
     devinfra: git+https://github.com/pytest-dev/pytest.git