diff --git a/.github/workflows/ensure-build.yml b/.github/workflows/ensure-build.yml
index f59ef03..471c298 100644
--- a/.github/workflows/ensure-build.yml
+++ b/.github/workflows/ensure-build.yml
@@ -10,6 +10,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - name: Install GraphicsMagick
+        run: sudo apt install graphicsmagick
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v2
         with: