diff --git a/.github/workflows/insolver-tests.yaml b/.github/workflows/insolver-tests.yaml
index 3795c90..a12ac3b 100644
--- a/.github/workflows/insolver-tests.yaml
+++ b/.github/workflows/insolver-tests.yaml
@@ -28,6 +28,9 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
+    - name: Install libomp for lightgbm (macOS)
+      if: matrix.os == 'macos-latest'
+      run: brew install libomp
     - name: Install dependencies
       shell: bash
       run: |