diff --git a/.github/workflows/third_party.yml b/.github/workflows/third_party.yml
index 359a6e4a..0bf1c820 100644
--- a/.github/workflows/third_party.yml
+++ b/.github/workflows/third_party.yml
@@ -48,31 +48,27 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
     steps:
-      - name: Checkout pydantic
-        uses: actions/checkout@v4
+      - name: Setup Python
+        uses: actions/setup-python@v5
         with:
-          repository: pydantic/pydantic
-      - name: Edit pydantic pyproject.toml
-        # pydantic's python-requires means pdm won't let us add typing-extensions-latest
-        # as a requirement unless we do this
-        run: sed -i 's/^requires-python = .*/requires-python = ">=3.8"/' pyproject.toml
+          python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
+      - name: Install uv
+        run: curl -LsSf https://astral.sh/uv/install.sh | sh
+      - name: Checkout pydantic
+        run: git clone --depth=1 https://github.com/pydantic/pydantic.git || git clone --depth=1 https://github.com/pydantic/pydantic.git
       - name: Checkout typing_extensions
         uses: actions/checkout@v4
         with:
           path: typing-extensions-latest
-      - name: Setup pdm for pydantic tests
-        uses: pdm-project/setup-pdm@v4
-        with:
-          python-version: ${{ matrix.python-version }}
-          allow-python-prereleases: true
       - name: Add local version of typing_extensions as a dependency
-        run: pdm add ./typing-extensions-latest
+        run: cd pydantic; uv add --editable ../typing-extensions-latest
       - name: Install pydantic test dependencies
-        run: pdm install -G testing -G email
+        run: cd pydantic; uv sync --group dev
       - name: List installed dependencies
-        run: pdm list -vv  # pdm equivalent to `pip list`
+        run: cd pydantic; uv pip list
       - name: Run pydantic tests
-        run: pdm run pytest
+        run: cd pydantic; uv run pytest
 
   typing_inspect:
     name: typing_inspect tests
@@ -93,21 +89,18 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
     steps:
-      - name: Checkout typing_inspect
-        uses: actions/checkout@v4
-        with:
-          repository: ilevkivskyi/typing_inspect
-          path: typing_inspect
-      - name: Checkout typing_extensions
-        uses: actions/checkout@v4
-        with:
-          path: typing-extensions-latest
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install uv
         run: curl -LsSf https://astral.sh/uv/install.sh | sh
+      - name: Checkout typing_inspect
+        run: git clone --depth=1 https://github.com/ilevkivskyi/typing_inspect.git || git clone --depth=1 https://github.com/ilevkivskyi/typing_inspect.git
+      - name: Checkout typing_extensions
+        uses: actions/checkout@v4
+        with:
+          path: typing-extensions-latest
       - name: Install typing_inspect test dependencies
         run: |
           set -x
@@ -141,15 +134,6 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
     steps:
-      - name: Check out pyanalyze
-        uses: actions/checkout@v4
-        with:
-          repository: quora/pyanalyze
-          path: pyanalyze
-      - name: Checkout typing_extensions
-        uses: actions/checkout@v4
-        with:
-          path: typing-extensions-latest
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
@@ -157,6 +141,12 @@ jobs:
           allow-prereleases: true
       - name: Install uv
         run: curl -LsSf https://astral.sh/uv/install.sh | sh
+      - name: Check out pyanalyze
+        run: git clone --depth=1 https://github.com/quora/pyanalyze.git || git clone --depth=1 https://github.com/quora/pyanalyze.git
+      - name: Checkout typing_extensions
+        uses: actions/checkout@v4
+        with:
+          path: typing-extensions-latest
       - name: Install pyanalyze test requirements
         run: |
           set -x
@@ -190,15 +180,6 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
     steps:
-      - name: Check out typeguard
-        uses: actions/checkout@v4
-        with:
-          repository: agronholm/typeguard
-          path: typeguard
-      - name: Checkout typing_extensions
-        uses: actions/checkout@v4
-        with:
-          path: typing-extensions-latest
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
@@ -206,6 +187,12 @@ jobs:
           allow-prereleases: true
       - name: Install uv
         run: curl -LsSf https://astral.sh/uv/install.sh | sh
+      - name: Check out typeguard
+        run: git clone --depth=1 https://github.com/agronholm/typeguard.git || git clone --depth=1 https://github.com/agronholm/typeguard.git
+      - name: Checkout typing_extensions
+        uses: actions/checkout@v4
+        with:
+          path: typing-extensions-latest
       - name: Install typeguard test requirements
         run: |
           set -x
@@ -240,21 +227,18 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
     steps:
-      - name: Check out typed-argument-parser
-        uses: actions/checkout@v4
-        with:
-          repository: swansonk14/typed-argument-parser
-          path: typed-argument-parser
-      - name: Checkout typing_extensions
-        uses: actions/checkout@v4
-        with:
-          path: typing-extensions-latest
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install uv
         run: curl -LsSf https://astral.sh/uv/install.sh | sh
+      - name: Check out typed-argument-parser
+        run: git clone --depth=1 https://github.com/swansonk14/typed-argument-parser.git || git clone --depth=1 https://github.com/swansonk14/typed-argument-parser.git
+      - name: Checkout typing_extensions
+        uses: actions/checkout@v4
+        with:
+          path: typing-extensions-latest
       - name: Configure git for typed-argument-parser tests
         # typed-argument parser does this in their CI,
         # and the tests fail unless we do this
@@ -295,15 +279,6 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
     steps:
-      - name: Checkout mypy for stubtest and mypyc tests
-        uses: actions/checkout@v4
-        with:
-          repository: python/mypy
-          path: mypy
-      - name: Checkout typing_extensions
-        uses: actions/checkout@v4
-        with:
-          path: typing-extensions-latest
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
@@ -311,6 +286,12 @@ jobs:
           allow-prereleases: true
       - name: Install uv
         run: curl -LsSf https://astral.sh/uv/install.sh | sh
+      - name: Checkout mypy for stubtest and mypyc tests
+        run: git clone --depth=1 https://github.com/python/mypy.git || git clone --depth=1 https://github.com/python/mypy.git
+      - name: Checkout typing_extensions
+        uses: actions/checkout@v4
+        with:
+          path: typing-extensions-latest
       - name: Install mypy test requirements
         run: |
           set -x
@@ -346,30 +327,29 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
     steps:
-      - name: Checkout cattrs
-        uses: actions/checkout@v4
+      - name: Setup Python
+        uses: actions/setup-python@v5
         with:
-          repository: python-attrs/cattrs
+          python-version: ${{ matrix.python-version }}
+      - name: Checkout cattrs
+        run: git clone --depth=1 https://github.com/python-attrs/cattrs.git || git clone --depth=1 https://github.com/python-attrs/cattrs.git
       - name: Checkout typing_extensions
         uses: actions/checkout@v4
         with:
           path: typing-extensions-latest
-      - name: Setup Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
       - name: Install pdm for cattrs
         run: pip install pdm
       - name: Add latest typing-extensions as a dependency
         run: |
+          cd cattrs
           pdm remove typing-extensions
-          pdm add --dev ./typing-extensions-latest
+          pdm add --dev ../typing-extensions-latest
       - name: Install cattrs test dependencies
-        run: pdm install --dev -G :all
+        run: cd cattrs; pdm install --dev -G :all
       - name: List all installed dependencies
-        run: pdm list -vv
+        run: cd cattrs; pdm list -vv
       - name: Run cattrs tests
-        run: pdm run pytest tests
+        run: cd cattrs; pdm run pytest tests
 
   create-issue-on-failure:
     name: Create an issue if daily tests failed
diff --git a/pyproject.toml b/pyproject.toml
index 51276151..f66cf6bc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ version = "4.12.2"
 description = "Backported and Experimental Type Hints for Python 3.8+"
 readme = "README.md"
 requires-python = ">=3.8"
-license = { file = "LICENSE" }
+license = { text = "PSF-2.0" }
 keywords = [
     "annotations",
     "backport",