diff --git a/.github/workflows/install_by_pak.yaml b/.github/workflows/install_by_pak.yaml
index 219ef3bb..ba880bec 100644
--- a/.github/workflows/install_by_pak.yaml
+++ b/.github/workflows/install_by_pak.yaml
@@ -30,10 +30,14 @@ jobs:
 
       - uses: r-lib/actions/setup-pandoc@v2
 
-      - name: Install libglpk40
+      - name: Install libglpk40 (Ubuntu)
         if: ${{ matrix.config.os == 'ubuntu-latest' }}
         run: sudo apt-get install -y libglpk40
 
+      - name: Install xquartz (Mac OS)
+        if: ${{ matrix.config.os == 'macos-latest' }}
+        run: brew install --cask xquartz
+
       - uses: r-lib/actions/setup-r@v2
         with:
           r-version: ${{ matrix.config.r }}