diff --git a/.cruft.json b/.cruft.json
deleted file mode 100644
index 250ced0..0000000
--- a/.cruft.json
+++ /dev/null
@@ -1,12 +0,0 @@
-{
-  "template": "https://github.com/mkoeppe/sage",
-  "commit": "016c53ef397a9a3a764b467ab45de04f4284c0c8",
-  "checkout": "sagemath-environment-cookiecutter",
-  "context": {
-    "cookiecutter": {
-      "project_name": "pplpy",
-      "_template": "https://github.com/mkoeppe/sage"
-    }
-  },
-  "directory": "pkgs/sage-project-cookiecutter/sage_project_cookiecutter/sagemath-upstream-package-template"
-}
diff --git a/.github/workflows/dist.yml b/.github/workflows/dist.yml
index 5346b22..1d02225 100644
--- a/.github/workflows/dist.yml
+++ b/.github/workflows/dist.yml
@@ -24,7 +24,7 @@ jobs:
         run: |
           python3 -m pip install build
           python3 -m build --sdist
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v5
         with:
           path: "dist/*.tar.gz"
           name: dist
@@ -37,33 +37,22 @@ jobs:
         if: env.CAN_DEPLOY == 'true' && github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
 
   build_wheels:
-    name: Build wheels on ${{ matrix.os }}, arch ${{ matrix.arch }}
+    name: Build wheels on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     needs: sdists_for_pypi
     strategy:
       fail-fast: false
       matrix:
-        include:
-          - os: ubuntu-latest
-            arch: x86_64
-          - os: ubuntu-latest
-            arch: i686
-          - os: macos-latest
-            arch: auto
-          - os: macos-14
-            arch: auto
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - ubuntu-24.04-arm
+          - macos-15-intel
     env:
       # SPKGs to install as system packages
-      SPKGS: _bootstrap _prereq
+      SPKGS: _bootstrap _prereq gmp mpfr mpc
       # Non-Python packages to install as spkgs
       TARGETS_PRE: gmp mpfr mpc ppl-ensure
-      # Disable building PyPy wheels on all platforms
-      # Disable musllinux until #33083 provides alpine package information
-      CIBW_SKIP: "pp* *-musllinux*"
-      #
-      CIBW_ARCHS: ${{ matrix.arch }}
-      # https://cibuildwheel.readthedocs.io/en/stable/options/#requires-python
-      CIBW_PROJECT_REQUIRES_PYTHON: ">=3.9"
       # Environment during wheel build
       CIBW_ENVIRONMENT: "PATH=$(pwd)/local/bin:$PATH CPATH=$(pwd)/local/include:$CPATH LIBRARY_PATH=$(pwd)/local/lib:$LIBRARY_PATH LD_LIBRARY_PATH=$(pwd)/local/lib:$LD_LIBRARY_PATH PKG_CONFIG_PATH=$(pwd)/local/share/pkgconfig:$PKG_CONFIG_PATH ACLOCAL_PATH=/usr/share/aclocal"
       # Use 'build', not 'pip wheel'
@@ -74,7 +63,7 @@ jobs:
           repository:   sagemath/sage
           ref:          develop
 
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v6
         with:
           name: dist
           path: dist
@@ -84,7 +73,7 @@ jobs:
         # Installing pipx follows the approach of https://github.com/pypa/cibuildwheel/pull/1743
         id: python
         with:
-          python-version: "3.8 - 3.12"
+          python-version: "3.12 - 3.14"
           update-environment: false
 
       - name: Build platform wheels
@@ -97,16 +86,16 @@ jobs:
         run: |
           "${{ steps.python.outputs.python-path }}" -m pip install pipx
           export PATH=build/bin:$PATH
-          export CIBW_BEFORE_ALL="( $(sage-print-system-package-command debian --yes --no-install-recommends install $(sage-get-system-packages debian $SPKGS)) || $(sage-print-system-package-command fedora --yes --no-install-recommends install $(sage-get-system-packages fedora $SPKGS | sed s/pkg-config/pkgconfig/)) || ( $(sage-print-system-package-command homebrew --yes --no-install-recommends install $(sage-get-system-packages homebrew $SPKGS)) || echo error ignored) ) && ./bootstrap && ./configure --enable-build-as-root --enable-fat-binary && MAKE=\"make -j6\" make V=0 $TARGETS_PRE"
+          export CIBW_BEFORE_ALL="( $(sage-print-system-package-command debian --yes --no-install-recommends install $(sage-get-system-packages debian $SPKGS)) || $(sage-print-system-package-command fedora --yes --no-install-recommends install $(sage-get-system-packages fedora $SPKGS | sed s/pkg-config/pkgconfig/)) || ( $(sage-print-system-package-command homebrew --yes --no-install-recommends install $(sage-get-system-packages homebrew $SPKGS)) || $(sage-print-system-package-command alpine --yes --no-install-recommends install $(sage-get-system-packages alpine $SPKGS)) || echo error ignored) ) && ./bootstrap && ./configure --enable-build-as-root --enable-fat-binary --disable-meson-check --disable-boost && MAKE=\"make -j6\" make V=0 $TARGETS_PRE"
           mkdir -p unpacked
           for pkg in pplpy; do
               (cd unpacked && tar xfz - ) < dist/$pkg*.tar.gz
-              "${{ steps.python.outputs.python-path }}" -m pipx run cibuildwheel==2.17.0 unpacked/$pkg*
+              "${{ steps.python.outputs.python-path }}" -m pipx run cibuildwheel==3.2.1 unpacked/$pkg*
           done
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v5
         with:
-          name: wheels
+          name: wheels-${{ matrix.os }}
           path: ./wheelhouse/*.whl
 
   pypi-publish:
@@ -119,7 +108,7 @@ jobs:
       CAN_DEPLOY: ${{ secrets.SAGEMATH_PYPI_API_TOKEN != '' }}
     steps:
 
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v6
         with:
           name: wheels
           path: wheelhouse
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 91bfa90..1c50c94 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,49 +11,49 @@ jobs:
   test:
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
-        cython: ["cython", "cython<3.0.0"]
-        exclude:
-          - python-version: 3.12
-            cython: cython<3.0.0
+        python: ["3.12", "3.13", "3.14"]
     steps:
       - uses: actions/checkout@v2
         with: { submodules: recursive }
-      - uses: conda-incubator/setup-miniconda@v2
-        with: { miniforge-variant: "Mambaforge", miniforge-version: "latest", python-version: "${{matrix.python-version}}" }
-      - name: Install pplpy dependencies
-        shell: bash -l {0}
-        run: |
-          mamba install --quiet setuptools cysignals ppl gmp mpfr mpc "${{matrix.cython}}"
-      - name: Install gmpy2 via mamba
-        shell: bash -l {0}
-        if: ${{ matrix.python-version != '3.12' }}
-        run: |
-          mamba install --quiet gmpy2
-          python -c 'import gmpy2; print(gmpy2.version())'
-      - name: Install gmpy2 via pip
+
+      - name: Setup Conda environment
+        uses: conda-incubator/setup-miniconda@v3
+        with:
+          python-version: ${{ matrix.python }}
+          # Disabled for now due to
+          # https://github.com/conda-incubator/setup-miniconda/issues/379
+          # miniforge-version: latest
+          use-mamba: true
+          channels: conda-forge
+          channel-priority: true
+
+      - name: Install dependencies
         shell: bash -l {0}
-        if: ${{ matrix.python-version == '3.12' }}
         run: |
-          pip install --pre gmpy2==2.2.0a1
-          python -c 'import gmpy2; print(gmpy2.version())'
-      - name: Install pplpy
+          conda install --quiet ppl gmp mpfr mpc
+
+      - name: Build
         shell: bash -l {0}
         run: |
-          pip install --verbose --no-index --no-build-isolation .
+          pip install --verbose .
+
       - name: Install test dependencies
         run: |
-          mamba env update --quiet -n test -f environment.test.yml
+          conda env update --quiet -n test -f environment.test.yml
           conda list
-      - name: Linter
+
+      - name: Lint
         shell: bash -l {0}
         run: |
           cython-lint --ignore=E265,E266,E501,E741 --exclude='ppl_decl.pxd' ppl/
+
       - name: Run tests
         shell: bash -l {0}
         run: |
           python setup.py test
+
       - name: Show logs
         run: grep "" /dev/null `find -name '*.log'` || true
         if: ${{ always() }}
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
deleted file mode 100644
index 7c4ee24..0000000
--- a/.gitlab-ci.yml
+++ /dev/null
@@ -1,21 +0,0 @@
-image: ubuntu:20.04
-before_script:
-- export DEBIAN_FRONTEND=noninteractive   # avoid tzdata interactive configuration
-- apt-get -qq update
-- apt-get install -y apt-utils git libgmp-dev libmpfr-dev libmpc-dev libppl-dev $PKGS
-- $PYTHON --version
-# NOTE: currently it seems not possible to build the sdist without manually installing
-# dependencies. pyproject.toml is ignored by the call to 'setup.py sdist' below and the
-# install_requires of setuptools is broken with Cython.
-- $PYTHON -m pip install "gmpy2>=2.1.0b1"
-- $PYTHON setup.py sdist
-- $PYTHON -m pip -v install dist/pplpy-*.tar.gz
-
-python3:
-  stage: test
-  variables:
-    PYTHON: python3
-    PKGS: python3 python3-dev python3-pip python3-setuptools python3-wheel python3-sphinx cython3 python3-cysignals-bare
-  script:
-  - $PYTHON setup.py test
-  - make -w -C docs html
diff --git a/environment.test.yml b/environment.test.yml
index 0fba3b2..ffefef3 100644
--- a/environment.test.yml
+++ b/environment.test.yml
@@ -5,6 +5,7 @@ channels:
 dependencies:
   - sphinx
   - pip
+  - setuptools
   - pip:
     - linkchecker
     - cython-lint 
diff --git a/ppl/mip_problem.pyx b/ppl/mip_problem.pyx
index 2d0b737..daac7ff 100644
--- a/ppl/mip_problem.pyx
+++ b/ppl/mip_problem.pyx
@@ -72,7 +72,7 @@ cdef class MIP_Problem(object):
         >>> m.optimal_value()
         mpq(10,3)
         >>> float(_)
-        3.333333333333333
+        3.3333333333333335
         >>> m.optimizing_point()
         point(10/3, 0/3)
     """
diff --git a/pyproject.toml b/pyproject.toml
index 5a92e93..dd6ae83 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,6 +13,7 @@ description = "Python PPL wrapper"
 readme = "README.rst"
 authors = [{name = "Vincent Delecroix", email = "vincent.delecroix@labri.fr"}]
 license = {text = "GPL v3"}
+requires-python = ">=3.12"
 classifiers = [
     "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
     "Programming Language :: C++",
@@ -20,11 +21,11 @@ classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Operating System :: Unix",
     "Intended Audience :: Science/Research",
-    "Programming Language :: Python :: 3.8",
-    "Programming Language :: Python :: 3.9",
-    "Programming Language :: Python :: 3.10",
-    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3 :: Only",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
 ]
 keywords = [
     "polyhedron",
diff --git a/tox.ini b/tox.ini
deleted file mode 100644
index 9d8533c..0000000
--- a/tox.ini
+++ /dev/null
@@ -1,9 +0,0 @@
-[tox]
-envlist = py27, py36, py37, py38
-skip_missing_interpreters = true
-
-[testenv]
-whitelist_externals = make
-commands =
-    {envpython} setup.py test
-    make -w -C docs html