diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index ab7659dd..129122c2 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -5,12 +5,14 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13-dev']
         # https://numpy.org/neps/nep-0029-deprecation_policy.html
         numpy-version: ['1.22', 'latest', 'dev']
         exclude:
           - python-version: '3.12'
             numpy-version: '1.22'
+          - python-version: '3.13-dev'
+            numpy-version: '1.22'
       fail-fast: false
     steps:
       - uses: actions/checkout@v2
@@ -39,10 +41,10 @@ jobs:
         # will work with Cython, or trace coverage will be faster again.
       - name: Set CYTHON_COVERAGE=1
         run: echo "CYTHON_COVERAGE=1" >> $GITHUB_ENV
-        if: matrix.python-version != 3.12
+        if: matrix.python-version != '3.12' && matrix.python-version != '3.13-dev'
       - name: Disable Coverage Plugin
         run: sed -i '/plugins = Cython.Coverage/d' .coveragerc
-        if: matrix.python-version == 3.12
+        if: matrix.python-version == '3.12' || matrix.python-version == '3.13-dev'
       - name: In-place build
         run: |
           python setup.py clean
@@ -60,7 +62,7 @@ jobs:
       # Enable experimental faster sys.monitoring coverage for Python 3.12
       - name: Set COVERAGE_CORE=sysmon
         run: echo "COVERAGE_CORE=sysmon" >> $GITHUB_ENV
-        if: matrix.python-version == 3.12
+        if: matrix.python-version == '3.12' || matrix.python-version == '3.13-dev'
       - name: Run Tests
         run: |
           set -x