diff --git a/.github/workflows/ci_build.yml b/.github/workflows/ci_build.yml
index 1f2a797..e4f19d6 100644
--- a/.github/workflows/ci_build.yml
+++ b/.github/workflows/ci_build.yml
@@ -12,52 +12,31 @@ on:
 
 jobs:
 
-  linux_mac:
+  linux:
     timeout-minutes: 20
 
-    strategy:
-      matrix:
-        os: [ubuntu-latest, macos-latest]
-        shared: [true, false]
-        mpi: [mpich, openmpi]
-        exclude:
-        - os: macos-latest
-          shared: true
-
-    runs-on: ${{ matrix.os}}
+    runs-on: ubuntu-latest
 
     steps:
 
     - name: prereqs (Linux)
       if: runner.os == 'Linux'
-      run: sudo apt install --no-install-recommends ninja-build lib${{ matrix.mpi }}-dev
-
-    - name: prereqs (MacOS)
-      if: runner.os == 'macOS'
-      run: |
-        brew install ${{ matrix.mpi }} ninja
-        brew reinstall gcc
+      run: sudo apt install --no-install-recommends libopenmpi-dev
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Configure HDF5-MPI
-      run: >-
-        cmake
-        -GNinja
-        -S scripts -B scripts/build
-        --install-prefix ${{ runner.temp }}
-        -DBUILD_SHARED_LIBS:BOOL=${{ matrix.shared }}
+      run: cmake -B build --install-prefix ${{ runner.temp }}
+      working-directory: scripts
 
     - name: Build/install HDF5
-      run: cmake --build scripts/build
+      run: cmake --build build
+      working-directory: scripts
 
     - name: configure h5fortran
       run: >-
-        cmake
-        --preset default
-        -GNinja
+        cmake --preset default
         --install-prefix ${{ runner.temp }}
-        -DBUILD_SHARED_LIBS:BOOL=${{ matrix.shared }}
         -DCMAKE_PREFIX_PATH=${{ runner.temp }}
 
     - name: build h5fortran
@@ -70,11 +49,7 @@ jobs:
       run: cmake --install build
 
     - name: configure examples
-      run: >-
-        cmake
-        --preset default
-        -GNinja
-        -DCMAKE_PREFIX_PATH:PATH=${{ runner.temp }}
+      run: cmake --preset default -DCMAKE_PREFIX_PATH:PATH=${{ runner.temp }}
       working-directory: example
 
     - name: build Examples