diff --git a/.github/workflows/python-app.yml b/.github/workflows/python-app.yml
index 0df8c70..cfb39b9 100644
--- a/.github/workflows/python-app.yml
+++ b/.github/workflows/python-app.yml
@@ -15,7 +15,9 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
-    - name: Install dependencies
+    - name: Install system dependencies
+      run: sudo apt-get install build-essential libgtk-3-dev
+    - name: Install Python dependencies
       run: pip install -r install/requirements.txt
     - name: Run tests
       run: python tests/_Run_Tests.py nopause