diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 405ed54..0be229e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -9,7 +9,7 @@ on:
 jobs:
   test:
     name: "Test Python ${{ matrix.python-version }}"
-    runs-on: "ubuntu-22.04"
+    runs-on: "ubuntu-24.04"
     strategy:
       matrix:
         python-version: [
@@ -17,6 +17,7 @@ jobs:
           "3.10",
           "3.11",
           "3.12",
+          "3.13",
         ]
     steps:
       - name: "Check out repository"
@@ -32,10 +33,10 @@ jobs:
       - name: "Install tox"
         run: |
           python -m pip install --upgrade pip
-          pip install tox tox-gh-actions
+          pip install tox
       - name: "Run tox"
         run: |
-          tox -- --cov fixity --cov-config .coveragerc --cov-report xml:coverage.xml
+          tox -e py3 -- --cov fixity --cov-config .coveragerc --cov-report xml:coverage.xml
       - name: "Upload coverage report"
         if: github.repository == 'artefactual/fixity'
         uses: "codecov/codecov-action@v4"
@@ -47,14 +48,14 @@ jobs:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
   lint:
     name: "Lint"
-    runs-on: "ubuntu-22.04"
+    runs-on: "ubuntu-24.04"
     steps:
       - name: "Check out repository"
         uses: "actions/checkout@v4"
       - name: "Set up Python"
         uses: "actions/setup-python@v5"
         with:
-          python-version: "3.12"
+          python-version: "3.x"
           cache-dependency-path: |
             requirements.txt
             requirements-dev.txt
diff --git a/pyproject.toml b/pyproject.toml
index 0c8d965..63224be 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,6 +38,7 @@ classifiers = [
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
 ]
 authors = [
   {name = "Artefactual Systems Inc.", email = "info@artefactual.com"}
@@ -106,14 +107,7 @@ omit = [
 [tool.tox]
 legacy_tox_ini = """
     [tox]
-    envlist = py{39,310,311,312}, linting
-
-    [gh-actions]
-    python =
-        3.9: py39
-        3.10: py310
-        3.11: py311
-        3.12: py312
+    envlist = py3{9,10,11,12,13}, linting
 
     [testenv]
     skip_install = true