diff --git a/.github/workflows/ci_tests.yml b/.github/workflows/ci_tests.yml
index 4fb8e21..dbc1c57 100644
--- a/.github/workflows/ci_tests.yml
+++ b/.github/workflows/ci_tests.yml
@@ -21,6 +21,10 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: "3.10"
+    - name: Install system packages
+      run: |
+          sudo apt update
+          sudo apt install libudunits2-dev
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip