diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index c992b1f..3358e5f 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -13,7 +13,7 @@ jobs:
         python-version: ["3.9", "3.11", "3.12"]
         experimental: [false]
         include:
-          - python-version: "3.11"
+          - python-version: "3.12"
             os: "ubuntu-latest"
             experimental: true
 
@@ -43,20 +43,24 @@ jobs:
         if: matrix.experimental == true
         shell: bash -l {0}
         run: |
+          python -c "import xarray.backends"; \
+          python -m pip install versioneer pkgconfig; \
           python -m pip install \
           -f https://pypi.anaconda.org/scientific-python-nightly-wheels/simple/ \
           --trusted-host pypi.anaconda.org \
           --no-deps --pre --upgrade \
           numpy \
-          pandas; \
+          pandas \
+          scipy; \
           python -m pip install \
-          --no-deps --upgrade \
+          --no-deps --upgrade --pre --no-build-isolation \
           git+https://github.com/dask/dask \
           git+https://github.com/dask/distributed \
-          git+https://github.com/Unidata/cftime \
-          git+https://github.com/mapbox/rasterio \
+          git+https://github.com/rasterio/rasterio \
           git+https://github.com/pydata/bottleneck \
-          git+https://github.com/pydata/xarray;
+          git+https://github.com/zarr-developers/zarr \
+          git+https://github.com/pydata/xarray@2024.01.0;
+          python -m pip install -e . --no-deps --no-build-isolation;
 
       - name: Install trollimage
         shell: bash -l {0}
@@ -69,6 +73,7 @@ jobs:
       - name: Run unit tests
         shell: bash -l {0}
         run: |
+          python -c "import xarray.backends"
           pytest --cov=trollimage trollimage/tests --cov-report=xml --cov-report=
 
       - name: Upload unittest coverage to Codecov
diff --git a/.github/workflows/deploy.yaml b/.github/workflows/deploy.yaml
index 812048e..4c3813c 100644
--- a/.github/workflows/deploy.yaml
+++ b/.github/workflows/deploy.yaml
@@ -64,9 +64,6 @@ jobs:
           CIBW_SKIP: "cp36-* cp37-* cp38-* pp* *-manylinux_i686 *-musllinux_i686 *-musllinux_aarch64 *-win32"
           CIBW_ARCHS: "${{ matrix.cibw_archs }}"
           CIBW_TEST_SKIP: "*_arm64 *_universal2:arm64"
-          # below only for building against unstable numpy
-          CIBW_BUILD_FRONTEND: "pip; args: --no-build-isolation"
-          CIBW_BEFORE_BUILD: "pip install --pre --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple numpy cython setuptools versioneer"
 
       - uses: actions/upload-artifact@v4
         with:
diff --git a/pyproject.toml b/pyproject.toml
index 988581c..9012fc2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,8 +1,7 @@
 [build-system]
 requires = [
     "wheel",
-    'numpy; python_full_version<"3.12.0rc1"',
-    'numpy>=1.26.0rc1; python_full_version>="3.12.0rc1"',
+    "numpy>=2.0.0rc1,<2.3",
     "setuptools>=42",
     "versioneer",
     "Cython>=3.0.0"
diff --git a/trollimage/_colorspaces.pyx b/trollimage/_colorspaces.pyx
index 4f668f0..333e42e 100644
--- a/trollimage/_colorspaces.pyx
+++ b/trollimage/_colorspaces.pyx
@@ -18,7 +18,7 @@ np.import_array()
 #     bint npy_isnan(np.float32_t x) nogil
 
 # Function pointer type to allow for generic high-level functions
-ctypedef void (*CONVERT_FUNC)(floating[:] comp1, floating[:] comp2, floating[:] comp3, floating[:, ::1] out) nogil
+ctypedef void (*CONVERT_FUNC)(floating[:] comp1, floating[:] comp2, floating[:] comp3, floating[:, ::1] out) noexcept nogil
 
 
 cdef: