diff --git a/.github/workflows/publish_pypi.yml b/.github/workflows/publish_pypi.yml
index 919a00d6ef..a009828e6f 100644
--- a/.github/workflows/publish_pypi.yml
+++ b/.github/workflows/publish_pypi.yml
@@ -102,10 +102,10 @@ jobs:
       - name: Build wheels on Linux and MacOS
         run: python -m cibuildwheel --output-dir wheelhouse
         env:
-          # TODO: openblas no longer available on centos 7 i686 image, use blas instead for now
+          CIBW_ARCHS_LINUX: x86_64
           CIBW_BEFORE_ALL_LINUX: >
-            yum -y install blas-devel lapack-devel &&
-            bash build_manylinux_wheels/install_sundials.sh 5.8.1 6.5.0
+            yum -y install openblas-devel lapack-devel &&
+            bash build_manylinux_wheels/install_sundials.sh 6.0.3 6.5.0
 
           CIBW_BEFORE_BUILD_LINUX: "python -m pip install cmake casadi numpy"
           CIBW_BEFORE_BUILD_MACOS: >
@@ -135,13 +135,13 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
-          python-version: 3.8
+          python-version: 3.11
 
       - name: Install dependencies
-        run: pip install wheel
+        run: pip install --upgrade pip setuptools wheel build
 
       - name: Build sdist
-        run: python setup.py sdist --formats=gztar
+        run: python -m build --sdist
 
       - name: Upload sdist
         uses: actions/upload-artifact@v3
@@ -171,7 +171,7 @@ jobs:
         with:
           user: __token__
           password: ${{ secrets.PYPI_TOKEN }}
-          packages_dir: files/
+          packages-dir: files/
 
       - name: Publish on TestPyPI
         if: github.event.inputs.target == 'testpypi'
@@ -179,5 +179,5 @@ jobs:
         with:
           user: __token__
           password: ${{ secrets.TESTPYPI_TOKEN }}
-          packages_dir: files/
-          repository_url: https://test.pypi.org/legacy/
+          packages-dir: files/
+          repository-url: https://test.pypi.org/legacy/
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c400cc31ea..3344940521 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -42,6 +42,7 @@
 
 ## Breaking changes
 
+- Dropped support for i686 (32-bit) architectures on GNU/Linux distributions ([#3412](https://github.com/pybamm-team/PyBaMM/pull/3412))
 - The class `pybamm.thermal.OneDimensionalX` has been moved to `pybamm.thermal.pouch_cell.OneDimensionalX` to reflect the fact that the model formulation implicitly assumes a pouch cell geometry ([#3257](https://github.com/pybamm-team/PyBaMM/pull/3257))
 - The "lumped" thermal option now always used the parameters "Cell cooling surface area [m2]", "Cell volume [m3]" and "Total heat transfer coefficient [W.m-2.K-1]" to compute the cell cooling regardless of the chosen "cell geometry" option. The user must now specify the correct values for these parameters instead of them being calculated based on e.g. a pouch cell. An `OptionWarning` is raised to let users know to update their parameters ([#3257](https://github.com/pybamm-team/PyBaMM/pull/3257))
 - Numpy functions now work with PyBaMM symbols (e.g. `np.exp(pybamm.Symbol("a"))` returns `pybamm.Exp(pybamm.Symbol("a"))`). This means that parameter functions can be specified using numpy functions instead of pybamm functions. Additionally, combining numpy arrays with pybamm objects now works (the numpy array is converted to a pybamm array) ([#3205](https://github.com/pybamm-team/PyBaMM/pull/3205))
diff --git a/build_manylinux_wheels/install_sundials.sh b/build_manylinux_wheels/install_sundials.sh
index 709d9c13c7..3d14bde7c7 100644
--- a/build_manylinux_wheels/install_sundials.sh
+++ b/build_manylinux_wheels/install_sundials.sh
@@ -65,8 +65,8 @@ yum -y install openblas-devel
 
 mkdir -p build_sundials
 cd build_sundials
-KLU_INCLUDE_DIR=/usr/include
-KLU_LIBRARY_DIR=/usr/lib
+KLU_INCLUDE_DIR=/usr/local/include
+KLU_LIBRARY_DIR=/usr/local/lib
 SUNDIALS_DIR=sundials-$SUNDIALS_VERSION
 cmake -DENABLE_LAPACK=ON\
       -DSUNDIALS_INDEX_SIZE=32\