diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 62b3e2d..d323b30 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -34,21 +34,17 @@ jobs:
     name: python${{ matrix.python-version }} ${{ matrix.os }} rust-${{ matrix.rust}}
     runs-on: ${{ matrix.os }}
     strategy:
-      fail-fast: false  # If one platform fails, allow the rest to keep testing.
+      fail-fast: false # If one platform fails, allow the rest to keep testing.
       matrix:
         python-architecture: ["x64"]
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
-        os: [
-          "macos-13",
-          "ubuntu-latest",
-          "windows-latest",
-        ]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.13t"]
+        os: ["macos-13", "ubuntu-latest", "windows-latest"]
         rust: [stable]
         include:
-          - python-version: "3.12"
+          - python-version: "3.13"
             os: "ubuntu-latest"
             rust: "1.63"
-          - python-version: "3.12"
+          - python-version: "3.13"
             python-architecture: "arm64"
             os: "macos-latest"
             rust: "stable"
@@ -57,7 +53,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+        uses: Quansight-Labs/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
           architecture: ${{ matrix.python-python-architecture }}
@@ -73,7 +69,9 @@ jobs:
       - name: Test
         run: cargo test --verbose
 
-      - name: Test (abi3)
+      # https://github.com/PyO3/pyo3/issues/4709 - can't use abi3 w. freethreaded build
+      - if: ${{ !endsWith(matrix.python-version, 't') }}
+        name: Test (abi3)
         run: cargo test --verbose --features pyo3/abi3-py37
 
     env: