diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index ed427be..103d5f6 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -20,6 +20,7 @@ jobs:
       fail-fast: false
       matrix:
         py:
+          - "3.13"
           - "3.12"
           - "3.11"
           - "3.10"
@@ -46,6 +47,7 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.py }}
+          allow-prereleases: true
       - name: Pick environment to run
         run: |
           import os; import platform; import sys; from pathlib import Path
diff --git a/tox.ini b/tox.ini
index a7520f8..ac18f54 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,6 +3,7 @@ requires =
     tox>=4.2
 env_list =
     fix
+    py313
     py312
     py311
     py310