diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index d6f49e1..4939ccc 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 2.0.1
+current_version = 2.1.0
 commit = True
 tag = True
 
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 84ac163..ea879a8 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -10,18 +10,14 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
-        # exclude MacOS arm64 on 3.7
-        exclude:
-          - os: macos-latest
-            python-version: '3.7'
+        python-version: ['3.9', '3.10', '3.11', '3.12']
     runs-on: ${{ matrix.os }}
     steps:
     - name: Check out code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Set up Python
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
 
@@ -33,7 +29,41 @@ jobs:
         pip install -e .
 
     - name: Run linting tests on files in src
-      run: ruff src
+      run: ruff check src
 
     - name: Run tests
-      run: pytest
\ No newline at end of file
+      run: pytest
+
+  # test old versions of numpy; this follows advice in
+  # https://numpy.org/doc/stable/dev/depending_on_numpy.html#depending-on-numpy
+  old_numpy_test:
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        python-version: ['3.9', '3.10', '3.11', '3.12']
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v4
+
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Build wheel via wheel, then install it
+      run: |
+        python -m pip install build
+        python -m build  # This will pull in numpy 2.0 in an isolated env
+        python -m pip install dist/*.whl
+
+    - name: Test against oldest supported numpy version
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install --upgrade setuptools
+        python -m pip install numpy==1.26.4
+        # now run test suite
+        pip install -r requirements.txt
+        pip install pytest ruff
+        pip install -e .
+        pytest
\ No newline at end of file
diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index 0a64d71..9fa3513 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -32,7 +32,7 @@ env:
 jobs:
   build_sdist:
     name: Build SDist
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
     - uses: actions/checkout@v4
       with:
@@ -43,27 +43,32 @@ jobs:
       if: github.event.inputs.overrideVersion
       run: echo "SETUPTOOLS_SCM_PRETEND_VERSION=${{ github.event.inputs.overrideVersion }}" >> $GITHUB_ENV
 
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: '3.12'
+
     - name: Build SDist
       run: pipx run build --sdist
 
     - name: Check metadata
       run: pipx run twine check --strict dist/*
 
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
         path: dist/*.tar.gz
 
 
   build_arch_wheels:
     name: ${{ matrix.python }} on ${{ matrix.arch }}
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
-        python: [37, 38, 39, 310, 311, 312]
+        python: [39, 310, 311, 312]
         arch: [aarch64]
     steps:
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0
         submodules: true
@@ -77,7 +82,7 @@ jobs:
       with:
         platforms: all
 
-    - uses: pypa/cibuildwheel@v2.16
+    - uses: pypa/cibuildwheel@v2.20
       env:
         CIBW_BUILD: cp${{ matrix.python }}-manylinux_*
         CIBW_ARCHS: ${{ matrix.arch }}
@@ -87,7 +92,7 @@ jobs:
       shell: bash
 
     - name: Upload wheels
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         path: wheelhouse/*.whl
 
@@ -115,7 +120,7 @@ jobs:
       shell: bash
       run: echo "SETUPTOOLS_SCM_PRETEND_VERSION=${{ github.event.inputs.overrideVersion }}" >> $GITHUB_ENV
 
-    - uses: pypa/cibuildwheel@v2.16
+    - uses: pypa/cibuildwheel@v2.20
       env:
         CIBW_BUILD: ${{ matrix.build }}
         CIBW_ARCHS: ${{ matrix.arch }}
@@ -125,7 +130,7 @@ jobs:
       shell: bash
 
     - name: Upload wheels
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         path: wheelhouse/*.whl
 
diff --git a/REVISION b/REVISION
index 38f77a6..7ec1d6d 100644
--- a/REVISION
+++ b/REVISION
@@ -1 +1 @@
-2.0.1
+2.1.0
diff --git a/pyproject.toml b/pyproject.toml
index ad357e0..8c1df2f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,12 @@
 [project]
+requires-python = ">=3.9"
 name = "fastkde"
-dynamic = ["dependencies", "version", "optional-dependencies", "description", "readme", "authors", "keywords"]
+dynamic = ["version", "optional-dependencies", "description", "readme", "authors", "keywords"]
+dependencies = [
+    "numpy>=1.26.4",
+    "scipy",
+    "xarray",
+]
 
 [tool.setuptools.dynamic]
 dependencies = {file = ["requirements.txt"]}
@@ -16,7 +22,7 @@ requires = [
     "wheel",
     "toml",
     "setuptools_scm>=4.1.2",
-    "oldest-supported-numpy; python_version>='3.5'",
+    "numpy>=2.0.0",
 ]
 
 build-backend = "setuptools.build_meta"