diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1b34a886..c26408de 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,7 +20,13 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-20.04, windows-latest, macos-13]
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version:
+          - "3.8"
+          - "3.9"
+          - "3.10"
+          - "3.11"
+          - "3.12"
+          - "3.13"
         include:
           - os: macos-14
             python-version: "3.12"
@@ -30,6 +36,7 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
       - name: Setup uv
         uses: yezz123/setup-uv@v4
       - name: Set up Miniconda
@@ -39,6 +46,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
           miniforge-variant: Mambaforge
           use-mamba: true
+          channels: conda-forge/label/python_rc,conda-forge
       - name: Install Nox-under-test (uv)
         run:  uv pip install --system .
       - name: Run tests on ${{ matrix.os }} (tox <4)
@@ -50,6 +58,8 @@ jobs:
         with:
           name: coverage-${{ github.job }}-${{ strategy.job-index }}
           path: .coverage.*
+          include-hidden-files: true
+          if-no-files-found: error
 
   coverage:
     needs: build
diff --git a/noxfile.py b/noxfile.py
index 66f3e9ec..d1ad2f33 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -45,7 +45,7 @@
     "python, tox_version",
     [
         (python, tox_version)
-        for python in ("3.8", "3.9", "3.10", "3.11", "3.12")
+        for python in ("3.8", "3.9", "3.10", "3.11", "3.12", "3.13")
         for tox_version in ("latest", "<4")
     ],
 )
@@ -186,6 +186,7 @@ def _check_python_version(session: nox.Session) -> None:
         "3.10",
         "3.11",
         "3.12",
+        "3.13",
         "pypy3.9",
         "pypy3.10",
     ]
@@ -203,6 +204,7 @@ def github_actions_default_tests(session: nox.Session) -> None:
         "3.10",
         "3.11",
         "3.12",
+        "3.13",
         "pypy3.8",
         "pypy3.9",
         "pypy3.10",