diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ba1197a..d5b4dd7 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -84,15 +84,18 @@ jobs:
             platform: windows
 
     runs-on: ${{ matrix.os }}
+    env:
+      UV_PYTHON: ${{ matrix.interpreter }}
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: astral-sh/setup-uv@v4
         with:
-          python-version: ${{ matrix.interpreter }}
-          allow-prereleases: true
+          enable-cache: false
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: llvm-tools
+      - shell: bash
+        run: uv python install ${{ env.UV_PYTHON }}
       - name: prepare profiling directory
         shell: bash
         run: mkdir -p ${{ github.workspace }}/profdata
@@ -112,11 +115,16 @@ jobs:
       - name: Generate PGO data
         shell: bash
         run: |
-          pip install -r .github/workflows/_pgo_deps.txt
-          pip install granian --no-index --no-deps --find-links pgo_wheel --force-reinstall
-          PGO_RUN=y pytest tests
-      - name: merge PGO data
-        run: ${{ env.LLVM_PROFDATA }} merge -o ${{ github.workspace }}/merged.profdata ${{ github.workspace }}/profdata
+          uv venv .venv
+          uv pip install -r .github/workflows/_pgo_deps.txt
+          uv pip install granian --no-index --no-deps --find-links pgo_wheel --force-reinstall
+          PGO_RUN=y uv run pytest tests
+      - if: matrix.os != 'macos-13' || matrix.os != 'macos-14'
+        name: merge PGO data
+        run: ${{ env.LLVM_PROFDATA }} merge --failure-mode=all -o ${{ github.workspace }}/merged.profdata ${{ github.workspace }}/profdata
+      - if: matrix.os == 'macos-13' || matrix.os == 'macos-14'
+        name: merge PGO data
+        run: xcrun llvm-profdata merge --failure-mode=all -o ${{ github.workspace }}/merged.profdata ${{ github.workspace }}/profdata
       - name: Build PGO wheel
         uses: PyO3/maturin-action@v1
         with: