diff --git a/.github/workflows/testing_OSX.yml b/.github/workflows/testing_OSX.yml
index cd0eef5af..925b85c03 100644
--- a/.github/workflows/testing_OSX.yml
+++ b/.github/workflows/testing_OSX.yml
@@ -19,7 +19,8 @@ jobs:
        uses: actions/checkout@v4 
      - name: Preinstall 
        run: | 
-         brew install hdf5 fftw cfitsio muparser libomp numpy swig
+         brew install hdf5 fftw cfitsio muparser libomp swig
+         pip install numpy==1.26
      - name: Set up the build
        env:
          CXX: ${{ matrix.config.cxx }}