diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 12bfe71..e393640 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -15,8 +15,8 @@ jobs:
   lint:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6.2.0
         with:
           python-version: "3.11"
       - uses: pre-commit/action@v3.0.1
@@ -30,6 +30,8 @@ jobs:
       fail-fast: false
       matrix:
         py:
+          - "3.14"
+          - "3.13"
           - "3.12"
           - "3.11"
           - "3.10"
@@ -40,15 +42,15 @@ jobs:
           - "pypy-3.8"
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: setup python for tox
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6.2.0
         with:
           python-version: "3.12"
       - name: install tox
         run: python -m pip install tox
       - name: setup python for test ${{ matrix.py }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6.2.0
         with:
           python-version: ${{ matrix.py }}
       - name: Pick environment to run
@@ -64,26 +66,23 @@ jobs:
         run: tox -vv --notest
       - name: run test suite for ${{ matrix.py }}
         run: tox --skip-pkg-install
-      - name: Rename coverage report file
-        run: |
-          import os; import sys
-          os.rename(f".tox/.coverage.{os.environ['TOXENV']}", f".tox/.coverage.{os.environ['TOXENV']}-{sys.platform}")
-        shell: python
       - name: Upload coverage data
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v7
         with:
-          name: coverage-data
+          name: coverage-data-${{ matrix.py }}
           path: ".tox/.coverage.*"
+          include-hidden-files: true
+          overwrite: true
 
   coverage:
     name: Combine coverage
     runs-on: ubuntu-latest
     needs: test
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6.2.0
         with:
           python-version: "3.12"
       - name: Install tox
@@ -95,14 +94,15 @@ jobs:
       - name: Build package
         run: pyproject-build --wheel .
       - name: Download coverage data
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v7
         with:
-          name: coverage-data
+          pattern: coverage-data-*
+          merge-multiple: true
           path: .tox
       - name: Combine and report coverage
         run: tox -e coverage
       - name: Upload HTML report
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v7
         with:
           name: html-report
           path: .tox/htmlcov
@@ -118,9 +118,9 @@ jobs:
           - docs
           - type
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: setup Python "3.12"
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6.2.0
         with:
           python-version: "3.12"
       - name: install tox
@@ -134,12 +134,12 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: setup python to build package
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6.2.0
         with:
           python-version: "3.12"
       - name: install build
         run: python -m pip install build
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: build package
         run: python -m build --sdist --wheel . -o dist
       - name: publish to PyPi
diff --git a/tests/test_auto_attribs__py3.py b/tests/test_auto_attribs__py3.py
index 67b3ff8..8241f9d 100644
--- a/tests/test_auto_attribs__py3.py
+++ b/tests/test_auto_attribs__py3.py
@@ -28,9 +28,13 @@
             None,
             0xBAD,
             "Value of value 2989 is not of type {}".format(
-                "typing.Optional[str]"
-                if sys.version_info == (2, 7) or sys.version_info > (3, 9)
-                else "typing.Union[str, NoneType]"
+                "str | None"
+                if sys.version_info >= (3, 14)
+                else (
+                    "typing.Optional[str]"
+                    if sys.version_info == (2, 7) or sys.version_info > (3, 9)
+                    else "typing.Union[str, NoneType]"
+                )
             ),
         ),
     ],
@@ -75,9 +79,13 @@ def test_recursive():
     Self(Self())
     Self(Self(None))
     type_repr = (
-        "typing.Optional[test_auto_attribs__py3.Self]"
-        if sys.version_info == (2, 7) or sys.version_info > (3, 9)
-        else "typing.Union[test_auto_attribs__py3.Self, NoneType]"
+        "test_auto_attribs__py3.Self | None"
+        if sys.version_info >= (3, 14)
+        else (
+            "typing.Optional[test_auto_attribs__py3.Self]"
+            if sys.version_info == (2, 7) or sys.version_info > (3, 9)
+            else "typing.Union[test_auto_attribs__py3.Self, NoneType]"
+        )
     )
     msg = f"Value of parent 17 is not of type {type_repr}"
     with pytest.raises(ValueError, match=re.escape(msg)):
diff --git a/tests/test_union.py b/tests/test_union.py
index e1b11a9..49d7c20 100644
--- a/tests/test_union.py
+++ b/tests/test_union.py
@@ -16,16 +16,26 @@
         (
             2.0,
             Union[int, str],
-            "Value of foo 2.0 is not of type typing.Union[int, str]",
+            (
+                "Value of foo 2.0 is not of type {}".format(
+                    "int | str"
+                    if sys.version_info >= (3, 14)
+                    else "typing.Union[int, str]"
+                )
+            ),
         ),
         (
             [1, 2, "p"],
             List[Union[None, int]],
             (
                 "Value of foo p is not of type {} in [1, 2, 'p']".format(
-                    "typing.Optional[int]"
-                    if sys.version_info >= (3, 9)
-                    else "typing.Union[NoneType, int]"
+                    "None | int"
+                    if sys.version_info >= (3, 14)
+                    else (
+                        "typing.Optional[int]"
+                        if sys.version_info >= (3, 9)
+                        else "typing.Union[NoneType, int]"
+                    )
                 )
             ),
         ),