diff --git a/.github/workflows/build-ocp.yml b/.github/workflows/build-ocp.yml
index 5829b67..a6c5a33 100644
--- a/.github/workflows/build-ocp.yml
+++ b/.github/workflows/build-ocp.yml
@@ -24,7 +24,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ["macos-13", "macos-14", "ubuntu-20.04", "windows-2019"]
+        os: ["macos-13", "macos-14", "macos-15-arm64", "ubuntu-20.04", "ubuntu-22.04-arm", "windows-2019"]
         python-version: ["3.10", "3.11", "3.12", "3.13"]
         use-vtk: ["vtk", "novtk"]
 
@@ -43,6 +43,13 @@ jobs:
             sed_i: "gsed -i"
             env: "MACOSX_DEPLOYMENT_TARGET=11.1"
             shells: "bash"
+          - os: "macos-15-arm64"
+            vtk_libs: ".dylibs/libvtk*.dylib"
+            vtk_suffix: "/"
+            vtk_prefix: ""
+            sed_i: "gsed -i"
+            env: "MACOSX_DEPLOYMENT_TARGET=11.1"
+            shells: "bash"
           - os: "ubuntu-20.04"
             vtk_libs: "libvtk*.so"
             vtk_suffix: "/vtk-9.3/"
@@ -134,6 +141,10 @@ jobs:
             echo "Downloading cadquery_vtk-${{ env.VTK }}-cp313-cp313-macosx_11_0_arm64.whl"
             curl -L -O ${{ env.VTK313_URL }}/cadquery_vtk-${{ env.VTK }}-cp313-cp313-macosx_11_0_arm64.whl
 
+          elif [[ "${{ matrix.os }}" == "macos-15-arm64" ]]; then
+            echo "Downloading cadquery_vtk-${{ env.VTK }}-cp313-cp313-macosx_11_0_arm64.whl"
+            curl -L -O ${{ env.VTK313_URL }}/cadquery_vtk-${{ env.VTK }}-cp313-cp313-macosx_11_0_arm64.whl
+
           elif [[ "${{ matrix.os }}" == "macos-13" ]]; then
             echo "Downloading cadquery_vtk-9.3.1-cp313-cp313-macosx_11_0_x86_64.whl"
             curl -L -O ${{ env.VTK313_URL }}/cadquery_vtk-9.3.1-cp313-cp313-macosx_11_0_x86_64.whl
@@ -447,7 +458,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ["macos-13", "macos-14", "ubuntu-20.04", "windows-2019"]
+        os: ["macos-13", "macos-14", "macos-15-arm64", "ubuntu-20.04", "windows-2019"]
         python-version: ["3.11"]
 
         include:
@@ -459,6 +470,10 @@ jobs:
             sed_i: "gsed -i"
             env: "MACOSX_DEPLOYMENT_TARGET=11.1"
             shells: "bash"
+          - os: "macos-15-arm64"
+            sed_i: "gsed -i"
+            env: "MACOSX_DEPLOYMENT_TARGET=11.1"
+            shells: "bash"
           - os: "ubuntu-20.04"
             sed_i: "sed -i"
             env: "DUMMY=0"
@@ -638,7 +653,7 @@ jobs:
 
           rm -fr OCP  # remove the cached sources again
 
-          if [[ ${{ matrix.os }} == "macos-13" || ${{ matrix.os }} == "macos-14" ]]; then
+          if [[ ${{ matrix.os }} == "macos-13" || ${{ matrix.os }} == "macos-14"  || ${{ matrix.os }} == "macos-15-arm64" ]]; then
             curl -L -O https://github.com/CadQuery/OCP/releases/download/${{ env.OCP }}/OCP_src_stubs_macOS-latest.zip
           else
             curl -L -O https://github.com/CadQuery/OCP/releases/download/${{ env.OCP }}/OCP_src_stubs_${{ matrix.os }}.zip
@@ -674,7 +689,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ["macos-13", "macos-14", "ubuntu-20.04", "windows-2019"]
+        os: ["macos-13", "macos-14", "macos-15-arm64", "ubuntu-20.04", "windows-2019"]
         python-version: ["3.10", "3.11", "3.12", "3.13"]
         use-vtk: ["vtk", "novtk"]
 
@@ -693,6 +708,13 @@ jobs:
             module: "OCP.*.so"
             env: "MACOSX_DEPLOYMENT_TARGET=11.1"
             shells: "bash"
+          - os: "macos-15-arm64"
+            delocate: delocate
+            plat: macosx_11_1_arm64
+            sed_i: "gsed -i"
+            module: "OCP.*.so"
+            env: "MACOSX_DEPLOYMENT_TARGET=11.1"
+            shells: "bash"
           - os: "ubuntu-20.04"
             delocate: auditwheel patchelf
             plat: manylinux_2_31_x86_64
@@ -1175,7 +1197,11 @@ jobs:
         if: matrix.python-version == '3.13' && matrix.use-vtk == 'vtk'
         shell: bash -l {0}
         run: |
-          if [[ "${{ matrix.os }}" == "macos-14" ]]; then
+          if [[ "${{ matrix.os }}" == "macos-15-arm64" ]]; then
+            echo "Downloading cadquery_vtk-${{ env.VTK }}-cp313-cp313-macosx_11_0_arm64.whl"
+            curl -L -O ${{ env.VTK313_URL }}/cadquery_vtk-${{ env.VTK }}-cp313-cp313-macosx_11_0_arm64.whl
+
+          elif [[ "${{ matrix.os }}" == "macos-14" ]]; then
             echo "Downloading cadquery_vtk-${{ env.VTK }}-cp313-cp313-macosx_11_0_arm64.whl"
             curl -L -O ${{ env.VTK313_URL }}/cadquery_vtk-${{ env.VTK }}-cp313-cp313-macosx_11_0_arm64.whl
 
diff --git a/.github/workflows/build-vtk.yml b/.github/workflows/build-vtk.yml
index 8e64224..fbb4d04 100644
--- a/.github/workflows/build-vtk.yml
+++ b/.github/workflows/build-vtk.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ["ubuntu-20.04", "macos-13", "macos-14", "windows-2019"]
+        os: ["ubuntu-20.04", "macos-13", "macos-14", "macos-15-arm64", "windows-2019"]
         python-version: ["3.13"]
         include:
           - os: "macos-13"
@@ -24,6 +24,9 @@ jobs:
           - os: "macos-14"
             sed_i: "sed -i '.bak'"
             shells: "bash"
+          - os: "macos-15-arm64"
+            sed_i: "sed -i '.bak'"
+            shells: "bash"
           - os: "ubuntu-20.04"
             sed_i: "sed -i"
             shells: "bash"
@@ -153,10 +156,10 @@ jobs:
         shell: cmd
         if: runner.os == 'Windows' && steps.cache-vtk-restore.outputs.cache-hit != 'true'
         run: |
-          call C:\Users\runneradmin\micromamba\condabin\micromamba.bat activate build-vtk 
+          call C:\Users\runneradmin\micromamba\condabin\micromamba.bat activate build-vtk
           call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
 
-          cd VTK-${{ env.VTK }}\build          
+          cd VTK-${{ env.VTK }}\build
           cmake -G Ninja ^
                 -D VTK_VERSIONED_INSTALL=ON ^
                 -D VTK_CUSTOM_LIBRARY_SUFFIX="9.3" -DVTK_VERSION_SUFFIX="" ^