diff --git a/.gitea/workflows/chart.yml b/.gitea/workflows/chart.yml
index 81440f3..d0e06cc 100644
--- a/.gitea/workflows/chart.yml
+++ b/.gitea/workflows/chart.yml
@@ -21,10 +21,12 @@ jobs:
         uses: azure/setup-helm@v4
         with:
           version: ${{ env.HELM_VERSION }}
-      - name: Install chart test dependency
-        run: python3 -m pip install --user PyYAML
       - name: Lint, render and test chart behavior
-        run: ./test.sh
+        run: |
+          set -euo pipefail
+          python3 -m venv "${RUNNER_TEMP}/diun-test-venv"
+          "${RUNNER_TEMP}/diun-test-venv/bin/pip" install PyYAML
+          PATH="${RUNNER_TEMP}/diun-test-venv/bin:${PATH}" ./test.sh
 
   publish:
     name: Publish and promote chart