diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 09c98f48e..f9a90f27f 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -18,13 +18,19 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13-dev"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
         architecture: ["x64", "x86"]
+        free-threaded: [false]
+        include:
+          - python-version: "3.13"
+            architecture: "x64"
+            free-threaded: true
 
     steps:
       - uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python-version }}
+        if: ${{ ! matrix.free-threaded }}
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
@@ -33,6 +39,19 @@ jobs:
           cache-dependency-path: .github/workflows/main.yml
           check-latest: true
 
+      # From https://py-free-threading.github.io/ci/#windows-ci-setup-via-custom-powershell
+      # Until either the following are available:
+      # https://github.com/actions/setup-python/issues/771
+      # https://github.com/astral-sh/uv/issues/7193
+      - name: Set up Python 3.13t
+        if: ${{ matrix.free-threaded }}
+        run: |
+          $pythonInstallerUrl = "https://www.python.org/ftp/python/3.13.0/python-3.13.0-amd64.exe"
+          Invoke-WebRequest $pythonInstallerUrl -OutFile setup-python.exe
+          Start-Process "setup-python.exe" -argumentlist "/quiet PrependPath=1 TargetDir=C:\Python313 Include_freethreaded=1" -wait
+          C:\Python313\python3.13t.exe -m pip install -r requirements.txt
+          C:\Python313\python3.13t.exe -c "import sys; print(sys._is_gil_enabled())"
+
       - name: Setup environment
         run: |
           python --version
@@ -69,11 +88,17 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.10", "3.11", "3.12", "3.13-dev"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
+        free-threaded: [false]
+        include:
+          - python-version: "3.13"
+            free-threaded: true
+
     steps:
       - uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python-version }}
+        if: ${{ ! matrix.free-threaded }}
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
@@ -82,6 +107,19 @@ jobs:
           cache-dependency-path: .github/workflows/main.yml
           check-latest: true
 
+      # From https://py-free-threading.github.io/ci/#windows-ci-setup-via-custom-powershell
+      # Until either the following are available:
+      # https://github.com/actions/setup-python/issues/771
+      # https://github.com/astral-sh/uv/issues/7193
+      - name: Set up Python 3.13t
+        if: ${{ matrix.free-threaded }}
+        run: |
+          $pythonInstallerUrl = "https://www.python.org/ftp/python/3.13.0/python-3.13.0-amd64.exe"
+          Invoke-WebRequest $pythonInstallerUrl -OutFile setup-python.exe
+          Start-Process "setup-python.exe" -argumentlist "/quiet PrependPath=1 TargetDir=C:\Python313 Include_freethreaded=1" -wait
+          C:\Python313\python3.13t.exe -m pip install -r requirements.txt
+          C:\Python313\python3.13t.exe -c "import sys; print(sys._is_gil_enabled())"
+
       - name: Setup Environment
         run: |
           python --version
@@ -135,8 +173,7 @@ jobs:
       fail-fast: false
       matrix:
         # mypy 1.5 dropped support for Python 3.7
-        # mypy won't understand "3.13-dev", keeping the CI simple by just omitting it
-        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"]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
@@ -154,7 +191,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13-dev"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5