diff --git a/.github/workflows/build_docs.yml b/.github/workflows/build_docs.yml
index f7a55fb7..80d803db 100644
--- a/.github/workflows/build_docs.yml
+++ b/.github/workflows/build_docs.yml
@@ -27,7 +27,7 @@ jobs:
       - name: Build quaddtype package
         run: |
           cd quaddtype/
-          python -m pip install . -v --no-build-isolation
+          python -m pip install . -v
       - name: Build Sphinx documentation
         run: |
           cd quaddtype/
diff --git a/.github/workflows/build_wheels.yml b/.github/workflows/build_wheels.yml
index a01cf81a..53928a29 100644
--- a/.github/workflows/build_wheels.yml
+++ b/.github/workflows/build_wheels.yml
@@ -39,16 +39,12 @@ jobs:
           CIBW_BEFORE_ALL: |
             yum update -y
             yum install -y cmake gcc gcc-c++ make git pkgconfig
-          CIBW_BEFORE_BUILD: |
-            pip install meson>=1.3.2 meson-python>=0.18.0 wheel ninja
-            pip install --pre --upgrade --timeout=60 --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple numpy
-          CIBW_BUILD_FRONTEND: "pip; args: --no-build-isolation"
           CIBW_ENVIRONMENT: >
             LDFLAGS="-fopenmp"
           CIBW_REPAIR_WHEEL_COMMAND: |
             auditwheel repair -w {dest_dir} --plat manylinux_2_28_x86_64 {wheel}
           CIBW_TEST_COMMAND: |
-            pip install --pre --upgrade --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple numpy
+            pip install numpy
             pip install --no-deps {wheel}
             pip install pytest pytest-run-parallel
             if python -c "import sys; exit(0 if hasattr(sys, '_is_gil_enabled') and not sys._is_gil_enabled() else 1)"; then
@@ -103,16 +99,12 @@ jobs:
           CIBW_ENABLE: cpython-prerelease cpython-freethreading
           # CIBW_ARCHS_MACOS: ${{ matrix.os == 'macos-13' && 'x86_64' || 'arm64' }}
           CIBW_BUILD_VERBOSITY: "3"
-          CIBW_BEFORE_BUILD: |
-            pip install meson>=1.3.2 meson-python>=0.18.0 wheel ninja
-            pip install --pre --upgrade --timeout=60 --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple numpy
-          CIBW_BUILD_FRONTEND: "pip; args: --no-build-isolation"
           CIBW_ENVIRONMENT: >
             MACOSX_DEPLOYMENT_TARGET="${{ matrix.os == 'macos-14' && '14.0' || '15.0' }}"
           CIBW_REPAIR_WHEEL_COMMAND: >
             delocate-wheel --require-archs {delocate_archs} -w {dest_dir} -v {wheel}
           CIBW_TEST_COMMAND: |
-            pip install --pre --upgrade --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple numpy
+            pip install numpy
             pip install --no-deps {wheel}
             pip install pytest pytest-run-parallel
             if python -c "import sys; exit(0 if hasattr(sys, '_is_gil_enabled') and not sys._is_gil_enabled() else 1)"; then
@@ -169,15 +161,11 @@ jobs:
           CIBW_BUILD_VERBOSITY: "3"
           DISTUTILS_USE_SDK: "1"
           MSSdk: "1"
-          CIBW_BEFORE_BUILD: >-
-            pip install meson meson-python ninja wheel &&
-            pip install --pre --upgrade --timeout=60 --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple numpy
-          CIBW_BUILD_FRONTEND: "pip; args: --no-build-isolation"
           CIBW_ENVIRONMENT: >
             CFLAGS="/DDISABLE_QUADBLAS $CFLAGS"
             CXXFLAGS="/DDISABLE_QUADBLAS $CXXFLAGS"
           CIBW_REPAIR_WHEEL_COMMAND: 'delvewheel repair -w {dest_dir} {wheel} --add-path C:\sleef\bin'
-          CIBW_TEST_COMMAND_WINDOWS: pip install --pre --upgrade --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple numpy && pip install --no-deps {wheel} && pip install pytest pytest-run-parallel && pytest -s {project}/tests
+          CIBW_TEST_COMMAND_WINDOWS: pip install numpy && pip install --no-deps {wheel} && pip install pytest pytest-run-parallel && pytest -s {project}/tests
           CIBW_TEST_EXTRAS: test
         shell: pwsh
         run: |
@@ -208,16 +196,14 @@ jobs:
 
       - name: Install build dependencies
         run: |
-          python -m pip install --upgrade pip
-          python -m pip install build pytest meson meson-python wheel ninja
-          python -m pip install --pre --upgrade --timeout=60 --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple numpy
+          python -m pip install --upgrade pip build
 
       - name: Build SDist & test sdist
         env:
           LDFLAGS: "-fopenmp"
         run: |
-          python -m build --sdist --no-isolation --outdir dist/
-          pip install --no-build-isolation "$(ls dist/*.tar.gz)"[test] -v
+          python -m build --sdist --outdir dist/
+          pip install "$(ls dist/*.tar.gz)"[test] -v
           pytest -s tests
         working-directory: ./quaddtype
 
diff --git a/.github/workflows/typecheck.yml b/.github/workflows/typecheck.yml
index 365433eb..4053d537 100644
--- a/.github/workflows/typecheck.yml
+++ b/.github/workflows/typecheck.yml
@@ -30,9 +30,7 @@ jobs:
       - name: install
         working-directory: quaddtype
         run: |
-          uv pip install --pre --extra-index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple numpy
-          uv pip install meson>=1.3.2 meson-python wheel ninja
-          uv pip install mypy pyright . --no-build-isolation
+          uv pip install mypy pyright .
 
       - name: pyright
         working-directory: quaddtype
diff --git a/quaddtype/pyproject.toml b/quaddtype/pyproject.toml
index feca2441..13f5db0e 100644
--- a/quaddtype/pyproject.toml
+++ b/quaddtype/pyproject.toml
@@ -3,7 +3,8 @@ requires = [
     "meson>=1.3.2",
     "meson-python>=0.18.0",
     "wheel",
-    "numpy>=2.0"
+    "cmake",
+    "numpy>=2.4"
 ]
 build-backend = "mesonpy"