diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 24c58159..466cdef1 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -39,30 +39,27 @@ jobs:
       - name: Check out code
         uses: actions/checkout@v7
 
-      - name: Set up Python
-        uses: actions/setup-python@v6
+      - name: Install uv
+        uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86 # v5.4.2
         with:
-          python-version: ${{ matrix.python-version }}
+          enable-cache: true
 
+      # Install from uv.lock so CI uses the same pinned versions as local dev
+      # (`--frozen` fails loudly if the lockfile drifts from pyproject.toml
+      # instead of silently resolving a new upstream release).
       - name: Install Dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install pytest
-          pip install -e .
+        run: uv sync --extra dev --frozen --python ${{ matrix.python-version }}
 
       - name: Test CUDA auto-detection (skips if no GPU)
-        run: |
-          pytest tests/comfy_cli/test_cuda_detect_real.py -v
+        run: uv run --frozen --extra dev --python ${{ matrix.python-version }} pytest tests/comfy_cli/test_cuda_detect_real.py -v
 
       - name: Test e2e
         env:
           PYTHONPATH: ${{ github.workspace }}
           TEST_E2E: true
-        run: |
-          pytest tests/e2e
+        run: uv run --frozen --extra dev --python ${{ matrix.python-version }} pytest tests/e2e
 
       - name: Test torch backend compilation
         env:
           TEST_TORCH_BACKEND: "true"
-        run: |
-          pytest tests/uv/test_torch_backend_compile.py -xvs
+        run: uv run --frozen --extra dev --python ${{ matrix.python-version }} pytest tests/uv/test_torch_backend_compile.py -xvs
diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index c0d45cca..f4fcc072 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -20,22 +20,22 @@ jobs:
     steps:
       - uses: actions/checkout@v7
 
-      - name: Set up Python
-        uses: actions/setup-python@v6
+      - name: Install uv
+        uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86 # v5.4.2
         with:
-          python-version: '3.10'  # Follow the min version in pyproject.toml
+          enable-cache: true
 
+      # Install from uv.lock so CI uses the same pinned versions as local dev
+      # (`--frozen` fails loudly if the lockfile drifts from pyproject.toml
+      # instead of silently resolving a new upstream release). `--python 3.10`
+      # follows the min version in pyproject.toml.
       - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install pytest pytest-cov jsonschema
-          pip install -e .
+        run: uv sync --extra dev --frozen --python 3.10
 
       - name: Run tests
         env:
           PYTHONPATH: ${{ github.workspace }}
-        run: |
-          pytest --cov=comfy_cli --cov-report=xml .
+        run: uv run --frozen --extra dev --python 3.10 pytest --cov=comfy_cli --cov-report=xml .
 
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v6.0.2