diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 4b72165af..a7ad3ffb7 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -2,6 +2,9 @@ name: build
 
 on: [push, pull_request]
 
+env:
+  UV_SYSTEM_PYTHON: 1
+
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -16,15 +19,15 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
       - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install ".[all, dev]"
+        run: uv pip install -e ".[dev, all]"
       - name: Install specific jsonschema
         # Only have to execute this if we don't want the latest jsonschema version
         if: ${{ matrix.jsonschema-version != 'latest' }}
         run: |
-          pip install jsonschema==${{ matrix.jsonschema-version }}
+          uv pip install jsonschema==${{ matrix.jsonschema-version }}
       - name: Maybe uninstall optional dependencies
         # We uninstall pyarrow and vegafusion for one job to test that we have not
         # accidentally introduced a hard dependency on these libraries.
@@ -32,17 +35,17 @@ jobs:
         # Also see https://github.com/vega/altair/pull/3114
         if: ${{ matrix.python-version == '3.9' }}
         run: |
-          pip uninstall -y pyarrow vegafusion vegafusion-python-embed vl-convert-python anywidget
+          uv pip uninstall pyarrow vegafusion vegafusion-python-embed vl-convert-python anywidget
       - name: Maybe install lowest supported pandas version
         # We install the lowest supported pandas version for one job to test that
         # it still works. Downgrade to the oldest versions of pandas and numpy that include
         # Python 3.9 wheels, so only run this job for Python 3.9
         if: ${{ matrix.python-version == '3.9' }}
         run: |
-          pip install pandas==1.1.3 numpy==1.19.3
+          uv pip install pandas==1.1.3 numpy==1.19.3
       - name: Test that schema generation has no effect
         run: |
-          pip install vl-convert-python
+          uv pip install vl-convert-python
           python tools/generate_schema_wrapper.py
           # This gets the paths of all files which were either deleted, modified
           # or are not yet tracked by Git
@@ -66,7 +69,7 @@ jobs:
           fi
       - name: Test with pytest
         run: |
-          pytest --pyargs --numprocesses=logical --doctest-modules tests
+          uv run pytest --pyargs --numprocesses=logical --doctest-modules tests
       - name: Validate Vega-Lite schema
         run: |
           # We install all 'format' dependencies of jsonschema as check-jsonschema
@@ -74,5 +77,5 @@ jobs:
           # We can always use the latest jsonschema version here.
           # uri-reference check is disabled as the URIs in the Vega-Lite schema do
           # not conform RFC 3986.
-          pip install 'jsonschema[format]' check-jsonschema --upgrade
-          check-jsonschema --check-metaschema altair/vegalite/v5/schema/vega-lite-schema.json --disable-formats uri-reference
+          uv pip install 'jsonschema[format]' check-jsonschema --upgrade
+          uv run check-jsonschema --check-metaschema altair/vegalite/v5/schema/vega-lite-schema.json --disable-formats uri-reference
diff --git a/.github/workflows/docbuild.yml b/.github/workflows/docbuild.yml
index 585630bea..72db59734 100644
--- a/.github/workflows/docbuild.yml
+++ b/.github/workflows/docbuild.yml
@@ -2,6 +2,9 @@ name: docbuild
 
 on: [push, pull_request]
 
+env:
+  UV_SYSTEM_PYTHON: 1
+
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -11,15 +14,16 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: "3.12"
+    - name: Install uv
+      uses: astral-sh/setup-uv@v4
     - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install hatch
+      run: uv pip install -e ".[dev, all, doc]"
     - name: Run doc:build-html
       run: |
-        hatch run doc:build-html
+        mkdir -p doc/_images
+        uv run sphinx-build -b html -d doc/_build/doctrees doc doc/_build/html
     - name: Run doc:doctest
       run: |
-        hatch run doc:doctest
+        uv run sphinx-build -b doctest -d doc/_build/doctrees doc doc/_build/doctest
 
         
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 4e89e2777..c321fc9a4 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -7,23 +7,22 @@ jobs:
     runs-on: ubuntu-latest
     name: ruff-mypy
     steps:
-    - uses: actions/checkout@v4
-    - name: Set up Python 3.12
+    - name: "Set up Python"
       uses: actions/setup-python@v5
       with:
         python-version: "3.12"
+    - uses: actions/checkout@v4
+    - name: Install uv
+      uses: astral-sh/setup-uv@v4
     # Installing all dependencies and not just the linters as mypy needs them for type checking
     - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install hatch
+      run: uv pip install -e ".[dev, all]" --system
     - name: Lint with ruff
       run: |        
-        hatch run ruff check .        
+        uv run ruff check
     - name: Check formatting with ruff
       run: |
-        hatch run ruff format --diff .
-        hatch run ruff format --check .
+        uv run ruff format --check --diff
     - name: Lint with mypy
       run: |
-        hatch run mypy altair tests
+        uv run mypy altair tests
diff --git a/altair/utils/core.py b/altair/utils/core.py
index 66a559fad..98daa0d0d 100644
--- a/altair/utils/core.py
+++ b/altair/utils/core.py
@@ -325,7 +325,7 @@ def numpy_is_subtype(dtype: Any, subtype: Any) -> bool:
     import numpy as np
 
     try:
-        return np.issubdtype(dtype, subtype)
+        return cast("bool", np.issubdtype(dtype, subtype))
     except (NotImplementedError, TypeError):
         return False
 
diff --git a/altair/utils/mimebundle.py b/altair/utils/mimebundle.py
index 56cd05a7e..9355d02bb 100644
--- a/altair/utils/mimebundle.py
+++ b/altair/utils/mimebundle.py
@@ -336,7 +336,7 @@ def _validate_normalize_engine(
 
 def _pngxy(data):
     """
-    read the (width, height) from a PNG header.
+    Read the (width, height) from a PNG header.
 
     Taken from IPython.display
     """
diff --git a/altair/utils/schemapi.py b/altair/utils/schemapi.py
index 7eaab77c1..0416c3405 100644
--- a/altair/utils/schemapi.py
+++ b/altair/utils/schemapi.py
@@ -723,7 +723,7 @@ def _format_params_as_table(param_dict_keys: Iterable[str]) -> str:
         max_column_width = 80
         # Output a square table if not too big (since it is easier to read)
         num_param_names = len(param_names)
-        square_columns = int(ceil(num_param_names**0.5))
+        square_columns = ceil(num_param_names**0.5)
         columns = min(max_column_width // max_name_length, square_columns)
 
         # Compute roughly equal column heights to evenly divide the param names
diff --git a/pyproject.toml b/pyproject.toml
index c353b9b9d..dbb8f0012 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -69,7 +69,7 @@ all = [
 ]
 dev = [
     "hatch>=1.13.0",
-    "ruff>=0.6.0",
+    "ruff>=0.8.4",
     "duckdb>=1.0",
     "ipython[kernel]",
     "pandas>=1.1.3",
@@ -347,6 +347,8 @@ ignore = [
     "B905",
     # mutable-class-default
     "RUF012",
+    # used-dummy-variable
+    "RUF052",
     # suppressible-exception
     # https://github.com/vega/altair/pull/3431#discussion_r1629808660
     "SIM105",
diff --git a/tests/utils/test_utils.py b/tests/utils/test_utils.py
index 2e8ae1214..23120e616 100644
--- a/tests/utils/test_utils.py
+++ b/tests/utils/test_utils.py
@@ -177,7 +177,7 @@ def test_sanitize_dataframe_colnames():
 
     # Test that non-string columns result in an error
     df.columns = [4, "foo", "bar"]
-    with pytest.raises(ValueError, match="Dataframe contains invalid column name: 4."):
+    with pytest.raises(ValueError, match=r"Dataframe contains invalid column name: 4."):
         sanitize_pandas_dataframe(df)
 
 
diff --git a/tools/schemapi/schemapi.py b/tools/schemapi/schemapi.py
index b41c61a85..b19ddad73 100644
--- a/tools/schemapi/schemapi.py
+++ b/tools/schemapi/schemapi.py
@@ -721,7 +721,7 @@ def _format_params_as_table(param_dict_keys: Iterable[str]) -> str:
         max_column_width = 80
         # Output a square table if not too big (since it is easier to read)
         num_param_names = len(param_names)
-        square_columns = int(ceil(num_param_names**0.5))
+        square_columns = ceil(num_param_names**0.5)
         columns = min(max_column_width // max_name_length, square_columns)
 
         # Compute roughly equal column heights to evenly divide the param names