diff --git a/.github/workflows/ci-op.yml b/.github/workflows/ci-op.yml
index bfa7dc88..870d8245 100644
--- a/.github/workflows/ci-op.yml
+++ b/.github/workflows/ci-op.yml
@@ -36,23 +36,23 @@ jobs:
         cc: ['gcc-11']
   
         include:
-          - os: macos-13
+          - os: macos-15
             version: '1.6'
             op: "ISO_OP"
             omp: 1
-            cc: gcc-13
+            cc: clang
 
-          - os: macos-13
+          - os: macos-15
             version: '1.8'
             op: "ISO_OP"
             omp: 1
-            cc: gcc-13
+            cc: clang
 
-          - os: macos-13
+          - os: macos-15
             version: '1.9'
             op: "ISO_OP"
             omp: 1
-            cc: gcc-13
+            cc: clang
 
           - os: ubuntu-latest
             version: '1.9'
@@ -77,16 +77,30 @@ jobs:
           arch: x64
 
       - name: Set up Python 3.9
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: 3.9
 
+      - name: Setup clang for osx
+        if: runner.os == 'macOS'
+        run: |
+          brew install libomp
+          python3 -m pip install -U pip numpy
+          echo "PATH=$PATH:/opt/homebrew/bin:$(brew --prefix llvm@18)/bin" >> $GITHUB_ENV
+          echo "LD_LIBRARY_PATH=$(brew --prefix llvm@18)/lib:$LD_LIBRARY_PATH" >> $GITHUB_ENV
+
       - name: Set julia python
         run: |
           echo "PYTHON=$(which python3)" >> $GITHUB_ENV
+          echo "PYCALL_JL_RUNTIME_PYTHON=$(which python3)" >> $GITHUB_ENV
           python3 -m pip install devito[tests,extras]@git+https://github.com/devitocodes/devito.git
           PYTHON=$(which python3) julia -e 'using Pkg;Pkg.add("PyCall");Pkg.build("PyCall")'
 
+      - name: Debug numpy path
+        run: |
+          python3 -c "import numpy; print(numpy.__file__)"
+          julia -e 'using PyCall;  np = pyimport("numpy"); @show np."__file__"'
+
       - name: Build JUDI
         uses: julia-actions/julia-buildpkg@latest